| Oak City Pharmacy, Pharmacy Services | Oakville |
| Oak Lake Medical Centre | Oakville |
| Oak Lake Pharmacy, Pharmacy Services | Oakville |
| Oak Park Community Pharmacy, Pharmacy Services | Oakville |
| Oak Park Family Care Centre, Walk In and Family Practice | Oakville |
| Oak Park Medical Clinic | Oakville |
| Oak Park Neighbourhood Centre, Oakville - Sawgrass Dr | Oakville |
| Oak Park Neighbourhood Centre, Food Bank | Oakville |
| Oak Park Neighbourhood Centre, Low Income Supports | Oakville |
| Oak Park Neighbourhood Centre, Churchill Neighbourhood Centre | Oakville |
| Oak Park Neighbourhood Centre, Family & Young Child Programs | Oakville |
| Oak Park Neighbourhood Centre, Licensed Child Care Centre | Oakville |
| Oak Park Neighbourhood Centre, Rental Facilities | Oakville |
| Oak Park Neighbourhood Centre, Youth & Adult Programs | Oakville |
| Oak Park Neighbourhood Centre, Year Round Low Income Tax Clinic | Oakville |
| Oaklands, Oakville, Non Profit Housing | Oakville |
| OakMed Family Health Team | Oakville |
| Oakridge Bible Chapel | Oakville |
| Oak-Trafalgar Medical Clinic, Family Practice and Walk-in Clinic | Oakville |
| Oakvillage Pharmacy, Pharmacy Services | Oakville |
| Oakville & District Kennel Club | Oakville |
| Oakville & Milton Humane Society | Oakville |
| Oakville & Milton Humane Society, Barkin' Bin Thrift Store | Oakville |
| Oakville (Milton) Model Flying Club | Milton |
| Oakville Academy for the Arts, Licensed Child Care Centre | Oakville |
| Oakville Aquatic Club | Oakville |
| Oakville Art Society | Oakville |
| Oakville Arts Council | Oakville |
| Oakville Association of Knitters and Crocheters | Oakville |
| Oakville Camera Club | Oakville |
| Oakville Cardiologists, Dorval site | Oakville |
| Oakville Cardiologists, North site | Oakville |
| Oakville Centre for the Performing Arts | Oakville |
| Oakville Centre for the Performing Arts, Rental Facilities | Oakville |
| Oakville Centre for the Performing Arts, Volunteer Group | Oakville |
| Oakville Chamber of Commerce | Oakville |
| Oakville Chamber Orchestra | Oakville |
| Oakville Chinese Network Society, Cultural Heritage Group | Oakville |
| Oakville Choir for Children & Youth | Oakville |
| Oakville Choral | Oakville |
| Oakville Christian Centre | Oakville |
| Oakville Christian School | Oakville |
| Oakville Club (The) | Oakville |
| Oakville Community Centre for Peace, Ecology and Human Rights | Oakville |
| Oakville Community FIRST Robotics Team, Orbit Robotics | Oakville |
| Oakville Community Foundation | Oakville |
| Oakville Cricket Club | Oakville |
| Oakville Curling Club | Oakville |
| Oakville Cycling Club | Oakville |
| Oakville Endoscopy Centre | Oakville |
| Oakville Festivals of Film and Art | Oakville |
| Oakville Galleries, Centennial Square | Oakville |
| Oakville Galleries, Art Classes and Camps | Oakville |
| Oakville Galleries, Elementary and Secondary School Programs in English and French | Oakville |
| Oakville Galleries, Gairloch Gardens | Oakville |
| Oakville Gamers | Oakville |
| Oakville Girls Softball Association | Oakville |
| Oakville Gymnastics Club | Oakville |
| Oakville Health Centre Clinic, Walk-in and Family Practice | Oakville |
| Oakville Historical Society | Oakville |
| Oakville Historical Society, Merrick Thomas Farm House Museum | Oakville |
| Oakville Hornets Girls Hockey Association | Oakville |
| Oakville Horticultural Society | Oakville |
| Oakville Hospital Foundation, Oakville Trafalgar Memorial Hospital | Oakville |
| Oakville Hydro | Oakville |
| Oakville Improv Theatre Company | Oakville |
| Oakville Independent Schools | Oakville |
| Oakville Lakeside Residents' Association | Oakville |
| Oakville Lawn Bowling Club | Oakville |
| Oakville Lions Club | Oakville |
| Oakville Literary Cafe (The) | Oakville |
| Oakville Little League Baseball | Oakville |
| Oakville Marine Search and Rescue | Oakville |
| Oakville Masonic Lodge | Oakville |
| Oakville Masters Men's Slo-Pitch League | Oakville |
| Oakville Masters Swim Club | Oakville |
| Oakville Meals on Wheels | Oakville |
| Oakville Milton and District Real Estate Board | Milton |
| Oakville Minor Baseball Association | Oakville |
| Oakville Minor Lacrosse Association | Oakville |
| Oakville Museum At Erchless Estate | Oakville |
| Oakville Museum At Erchless Estate, March Break & Summer Day Camps | Oakville |
| Oakville Newcomers' Club | Oakville |
| Oakville North Endoscopy Centre, Outpatient clinic | Oakville |
| Oakville OASIS Drawing Bee | Oakville |
| Oakville Parent-Child Centre, Oakville - 461 North Service Rd W - Main Location, Parent, Child & Family Programs | Oakville |
| Oakville Parent-Child Centre, Licensed Child Care Centre | Oakville |
| Oakville Parent-Child Centre, Oakville - 481 North Service Rd W - Satellite Location | Oakville |
| Oakville Parent-Child Centre, Oakville - Oakwood Public School | Oakville |
| Oakville Parent-Child Centre, Oakville - Oakwood Public School, Oakwood After School Program - Licensed Child Care Centre | Oakville |
| Oakville Parent-Child Centre, Oakville - Queen Elizabeth Park Community and Cultural Centre | Oakville |
| Oakville Pentecostal Apostolic Church | Oakville |
| Oakville Pharmacy, Pharmacy Services | Oakville |
| Oakville Physiotherapy Centre | Oakville |
| Oakville Players | Oakville |
| Oakville Power Boat Club | Oakville |
| Oakville Professional Fire Fighters Association | Oakville |
| Oakville Public Library, Central Branch, Branch Specific Services | Oakville |
| Oakville Public Library, Accessible Collections & Services | Oakville |
| Oakville Public Library, Central Branch, Community Food Corner | Oakville |
| Oakville Public Library, Clearview Branch, Branch Specific Services | Oakville |
| Oakville Public Library, Clearview Branch, Community Food Corner | Oakville |
| Oakville Public Library, Creation Zone | Oakville |
| Oakville Public Library, Friends of Oakville Public Library | Oakville |
| Oakville Public Library, Glen Abbey Branch, Branch Specific Services | Oakville |
| Oakville Public Library, Glen Abbey Branch, Community Food Corner | Oakville |
| Oakville Public Library, Iroquois Ridge Branch, Branch Specific Services | Oakville |
| Oakville Public Library, Library Services | Oakville |
| Oakville Public Library, OPL Express | Oakville |
| Oakville Public Library, Newcomer Programs | Oakville |
| Oakville Public Library, Sixteen Mile Branch, Branch Specific Services | Oakville |
| Oakville Public Library, White Oaks Branch, Branch Specific Services | Oakville |
| Oakville Public Library, Woodside Branch, Branch Specific Services | Oakville |
| Oakville Quilters' Guild | Oakville |
| Oakville Rangers Hockey Club | Oakville |
| Oakville React | Oakville |
| Oakville Renegades Track Club | Oakville |
| Oakville Runners Club | Oakville |
| Oakville Scottish Country Dance Group | Oakville |
| Oakville SDA Church | Oakville |
| Oakville Senior Citizens Residence | Oakville |
| Oakville Senior Ladies Basketball League | Oakville |
| Oakville Sewers Forum | Oakville |
| Oakville Soccer Club | Oakville |
| Oakville Soccer Club, Breaking Barriers Program | Oakville |
| Oakville Speed Skating Club | Oakville |
| Oakville Strokers | Oakville |
| Oakville Suzuki Association | Oakville |
| Oakville Symphony | Oakville |
| Oakville Symphony Youth Orchestra | Oakville |
| Oakville Thunder Volleyball Club | Oakville |
| Oakville Titans Football | Oakville |
| Oakville Town Medical Clinic, Walk-in Clinic and Family Practice | Oakville |
| Oakville Track & Field Club | Halton Region |
| Oakville Trafalgar Badminton Club, Recreational Badminton | Oakville |
| Oakville Trafalgar Lions Club | Oakville |
| Oakville Vocal Arts Festival | Oakville |
| Oakville Wind Orchestra | Oakville |
| Oakville Yacht Squadron | Oakville |
| Oakville Yacht Squadron, Sailing School | Oakville |
| Oakville. Building Services | Oakville |
| Oakville. Building, Planning and Development, Municipal Growth-Related Development | Oakville |
| Oakville. Building, Planning and Development, Heritage Oakville Advisory Committee | Oakville |
| Oakville. Clerks Department | Oakville |
| Oakville. Clerks Department, Commissioning Oaths and Affidavits | Oakville |
| Oakville. Clerks Department, Marriage, Lottery, and Liquor Licences | Oakville |
| Oakville. Economic Development, Invest Oakville | Oakville |
| Oakville. Finance Department, Seniors Property Tax Rebate / Deferral | Oakville |
| Oakville. Fire Department, Fire Services | Oakville |
| Oakville. Fire Department, Fire Prevention Programs | Oakville |
| Oakville. Fire Department, Public Fire Safety Education | Oakville |
| Oakville. Municipal Enforcement Services, Parking Operations | Oakville |
| Oakville. Municipal Enforcement Services, Business Licensing | Oakville |
| Oakville. Municipal Enforcement Services, By-law Services | Oakville |
| Oakville. Parks and Open Space | Oakville |
| Oakville. Parks and Open Space, Lions Valley Park | Oakville |
| Oakville. Parks and Open Space, Cemetery Services | Oakville |
| Oakville. Parks and Open Space, Leash Free Dog Parks | Oakville |
| Oakville. Parks and Open Space, Outdoor Skating Rinks | Oakville |
| Oakville. Parks and Open Space, Parks & Gardens | Oakville |
| Oakville. Parks and Open Space, Photography in Parks | Oakville |
| Oakville. Parks and Open Space, Splash Pads | Oakville |
| Oakville. Parks and Open Space, Trail System | Oakville |
| Oakville. Parks and Open Space, Oakville Harbours | Oakville |
| Oakville. Parks and Open Space, Greenhouse/Conservatory Facilities & Programs | Oakville |
| Oakville. Recreation and Culture | Oakville |
| Oakville. Recreation and Culture, Adult Programs | Oakville |
| Oakville. Recreation and Culture, Aquatics Programs | Oakville |
| Oakville. Recreation and Culture, Children's Programs | Oakville |
| Oakville. Recreation and Culture, Facility Rentals and Permits | Oakville |
| Oakville. Recreation and Culture, Glen Abbey Community Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Indoor and Outdoor Swimming Pools | Oakville |
| Oakville. Recreation and Culture, Iroquois Ridge Community Centre, Iroquois Ridge Older Adults Centre | Oakville |
| Oakville. Recreation and Culture, Iroquois Ridge Community Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Joshua's Creek Arenas, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Kinoak Arena, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Maple Grove Arena, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Oakville Recreational Leagues | Oakville |
| Oakville. Recreation and Culture, Community Activation Grant | Oakville |
| Oakville. Recreation and Culture, Community Spirit Awards | Oakville |
| Oakville. Recreation and Culture, Inclusion and Support Services | Oakville |
| Oakville. Recreation and Culture, Recreation Subsidy Programs | Oakville |
| Oakville. Recreation and Culture, Santa Claus Parade | Oakville |
| Oakville. Recreation and Culture, Special Events Service | Oakville |
| Oakville. Recreation and Culture, Oakville Trafalgar Community Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Online/Telephone Service, Without Walls (WOW) Program | Oakville |
| Oakville. Recreation and Culture, Preschool Programs | Oakville |
| Oakville. Recreation and Culture, Public Skating | Oakville |
| Oakville. Recreation and Culture, Queen Elizabeth Park Community and Cultural Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Queen Elizabeth Park Older Adult Centre | Oakville |
| Oakville. Recreation and Culture, River Oaks Community Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, River Oaks Community Centre, River Oaks Mature Adults Club | Oakville |
| Oakville. Recreation and Culture, School Break Camps and Workshops | Oakville |
| Oakville. Recreation and Culture, Seniors Programs | Oakville |
| Oakville. Recreation and Culture, Sir John Colborne Recreation Centre for Seniors, Interlink Choir | Oakville |
| Oakville. Recreation and Culture, Sir John Colborne Recreation Centre for Seniors, Seniors Working Action Group | Oakville |
| Oakville. Recreation and Culture, Sir John Colborne Recreation Centre for Seniors | Oakville |
| Oakville. Recreation and Culture, Sixteen Mile Sports Complex, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Skateboard Parks | Oakville |
| Oakville. Recreation and Culture, Trafalgar Park Community Centre, Recreation Facilities & Programs | Oakville |
| Oakville. Recreation and Culture, Trafalgar Park Older Adults Centre, Kerr Street Singers | Oakville |
| Oakville. Recreation and Culture, Trafalgar Park Older Adults Centre | Oakville |
| Oakville. Recreation and Culture, Youth Programs | Oakville |
| Oakville. Roads and Works Operations, Loose Leaf Collection | Oakville |
| Oakville. Roads and Works Operations, Snow Clearing | Oakville |
| Oakville. ServiceOakville, Municipal Services | Oakville |
| Oakville. ServiceOakville, Driveway Snow Windrow Clearing Program | Oakville |
| Oakville. ServiceOakville, Property Tax Payments | Oakville |
| Oakville. ServiceOakville, Coyote Information and Online Reporting System | Oakville |
| Oakville. ServiceOakville, My Neighbour's Construction | Oakville |
| Oakville. Town Council | Oakville |
| Oakville. Town Council, Mayor - Rob Burton | Oakville |
| Oakville. Town Council, Ward 1 Town and Regional Councillor - Sean O'Meara | Oakville |
| Oakville. Town Council, Ward 1 Town Councillor - Jonathan McNeice | Oakville |
| Oakville. Town Council, Ward 2 Town and Regional Councillor - Cathy Duddeck | Oakville |
| Oakville. Town Council, Ward 2 Town Councillor - Ray Chisholm | Oakville |
| Oakville. Town Council, Ward 3 Town and Regional Councillor - Janet Haslett-Theall | Oakville |
| Oakville. Town Council, Ward 3 Town Councillor - Dave Gittings | Oakville |
| Oakville. Town Council, Ward 4 Town and Regional Councillor - Allan Elgar | Oakville |
| Oakville. Town Council, Ward 4 Town Councillor - Peter Longo | Oakville |
| Oakville. Town Council, Ward 5 Town and Regional Councillor - Jeff Knoll | Oakville |
| Oakville. Town Council, Ward 5 Town Councillor - Marc Grant | Oakville |
| Oakville. Town Council, Ward 6 Town and Regional Councillor - Tom Adams | Oakville |
| Oakville. Town Council, Ward 6 Town Councillor - Natalia Lishchyna | Oakville |
| Oakville. Town Council, Ward 7 Town and Regional Councillor - Nav Nanda | Oakville |
| Oakville. Town Council, Ward 7 Town Councillor - Scott Xie | Oakville |
| Oakville. Transit | Oakville |
| Oakville. Transit, care-A-van | Oakville |
| Oakvillegreen Conservation Association | Oakville |
| Oakvillegreen Conservation Association, Treeplanting | Oakville |
| Oasis Centre des femmes, Oasis Centre des Femmes, Brampton Satellite Office | Brampton |
| Oasis Youth Care Programs, Oakville, Transitional Support Services for Youth | Oakville |
| OCASI - Ontario Council of Agencies Serving Immigrants, CitizenshipCounts.ca | Ontario |
| OCASI - Ontario Council of Agencies Serving Immigrants, NewYouth.ca | Ontario |
| OCASI - Ontario Council of Agencies Serving Immigrants, Settlement.Org | Ontario |
| OCASI - Ontario Council of Agencies Serving Immigrants, WelcomeOntario.ca | Ontario |
| OCASI - Ontario Council of Agencies Serving Immigrants, OCASI | Toronto |
| Office of the Hydro One Ombudsman, Hydro One Services Complaints | Toronto |
| Office of the Taxpayers' Ombudsperson | Ottawa |
| Older Women's Network | Toronto |
| Olsen Psychotherapy, Online Service, Online Counselling for Men in Ontario | Thunder Bay |
| Omagh Church of Christ, Milton | Milton |
| OmbudService for Life and Health Insurance, Online Services | Toronto |
| Ombudsman for Banking Services and Investments, Toronto | Toronto |
| Ombudsman Ontario, Children and Youth Unit | Toronto |
| Ombudsman Ontario | Toronto |
| Omega Canine Control Services | Halton Hills |
| Ontario Society of Chiropodists, Newmarket | Newmarket |
| ONE Fertility, Reproductive Care | Burlington |
| One Health Medical Center, Oakville, Family Practice and Walk-in Clinic | Oakville |
| One Stop Talk | Ontario |
| One Vascular Imaging, Oakville | Oakville |
| Ontario Aboriginal HIV/AIDS Strategy | Toronto Downtown North |
| Ontario Addiction Treatment Centres, Methadone Maintenance Treatment | Oakville |
| Ontario AIDS Network, Toronto | Toronto |
| Ontario Ancestors, Halton Peel Branch - Mailing Address, Genealogy Services | Halton Region |
| Ontario Association for Families of Children with Communication Disorders | St Thomas |
| Ontario Association of Children's Aid Societies, Toronto Office, OACAS Member Services | Toronto |
| Ontario Association of Children's Aid Societies, Toronto Office, YouthCAN | Toronto |
| Ontario Association of Interval and Transition Houses, OAITH Coalition Services | Toronto |
| Ontario Association of Optometrists, Eye See...Eye Learn | Toronto Downtown Central |
| Ontario Association of the Deaf | North York |
| Ontario Autism Coalition | Ontario |
| Ontario Automotive Recyclers Association, Car Heaven | London |
| Ontario Camps Association | Toronto |
| Ontario Caregiver Organization | Toronto |
| Ontario Chamber of Commerce, Online Service, Find a Chamber of Commerce | Ontario |
| Ontario Chiropractic Association | Toronto Downtown Central |
| Ontario Civilian Police Commission | Toronto |
| Ontario College Application Service | Guelph |
| Ontario College of Pharmacists | Toronto Downtown North |
| Ontario College of Social Workers and Social Service Workers | Toronto Downtown North |
| Ontario College of Teachers | Toronto |
| Ontario Community Support Association, Toronto | Toronto |
| Ontario Dental Association | Toronto Downtown North |
| Ontario Diagnostic Centres, Oakville, Diagnostic Imaging | Oakville |
| Ontario Diagnostic Centres, Milton, Diagnostic Imaging | Milton |
| Ontario Electric Railway Historical Association, Streetcar Museum | Milton |
| Ontario Energy Board, Consumer Relations | Toronto |
| Ontario Energy Board, Ontario Electricity Support Program | Toronto |
| Ontario Farmland Trust | Guelph |
| Ontario Federation for Cerebral Palsy, Clothing Pickup for Cerebral Palsy | Halton Region |
| Ontario Federation for Cerebral Palsy | Etobicoke North |
| Ontario Federation of Agriculture, Halton Region Federation of Agriculture | Milton |
| Ontario Federation of Agriculture, Farmer Wellness Initiative Helpline | Ontario |
| Ontario Federation of Agriculture, Guardian Network (The) - Suicide Prevention Program | Ontario |
| Ontario Federation of Indigenous Friendship Centres | Toronto |
| Ontario Federation of Labour | Toronto |
| Ontario Federation of Teaching Parents | Ontario |
| Ontario Health - Cancer Care Ontario | Toronto Downtown Central |
| Ontario Health - HealthForceOntario | Toronto Downtown |
| Ontario Health - Trillium Gift of Life Network | Toronto Downtown Central |
| Ontario Health atHome, Etobicoke | Etobicoke Central |
| Ontario Health atHome, Burlington Office | Burlington |
| Ontario Health atHome, Burlington - Fairview St, Acclaim Health Community Nursing Clinic | Burlington |
| Ontario Health atHome, Georgetown, Paramed-Georgetown Community Nursing Clinic | Georgetown |
| Ontario Health atHome, Milton - Main St E, Acclaim Health Community Nursing Clinic | Milton |
| Ontario Health atHome, Milton Office | Milton |
| Ontario Health atHome, Mississauga Office | Mississauga |
| Ontario Health atHome, Regional Learning Centre | Oakville |
| Ontario Health atHome, Oakville - Speers Rd, Acclaim Health Community Nursing Clinic | Oakville |
| Ontario Health atHome - Niagara | Hamilton |
| Ontario HIV Treatment Network (The) | Toronto Downtown North |
| Ontario Hospital Association | Toronto Downtown Central |
| Ontario Human Rights Commission | Toronto |
| Ontario Judicial Council, Toronto - Mailing Address | Toronto |
| Ontario Labour Relations Board | Toronto |
| Ontario Labour Relations Board, Toronto, Pay Equity Hearings Tribunal | Toronto |
| Ontario Medical Imaging, Georgetown, Diagnostic Imaging | Georgetown |
| Ontario Ministry of Municipal Affairs and Housing, Landlord and Tenant Board Southern Office, Ontario Landlord and Tenant Board | Hamilton |
| Ontario Mobile Imaging, Mobile Ultrasound | Mississauga |
| Ontario Motor Vehicle Industry Council | Toronto |
| Ontario Network of Sexual Assault / Domestic Violence Treatment Centres, Toronto | Toronto |
| Ontario Nonprofit Network | Toronto |
| Ontario One Call, Public Utility Locate Service | Guelph |
| Ontario Poison Centre | Toronto Downtown Central |
| Ontario Prader-Willi Syndrome Association | York |
| Ontario Provincial Police, Burlington Detachment, Highway Safety Division | Burlington |
| Ontario Provincial Police [Toronto-Peel region], Highway Safety Division, Mississauga Detachment | Mississauga |
| Ontario Psychological Association, Psychologists Referral Service | Toronto |
| Ontario Public Holidays and Retail Business Holidays | Ontario |
| Ontario Registered Music Teachers Association, Hamilton-Halton Branch - No Physical Address | Halton Region |
| Ontario Royals Baseball Club | Oakville |
| Ontario Secondary School Teachers Federation, Halton - District 20 | Burlington |
| Ontario Securities Commission, Get Smarter About Money | Toronto |
| Ontario Securities Commission | Toronto |
| Ontario Senior Games Association, Halton District 21 | Milton |
| Ontario Society of Registered Psychotherapists | Toronto Downtown Central |
| Ontario Society of Senior Citizens' Organizations | Toronto |
| Ontario Special Education Tribunal | Toronto |
| Ontario Steam and Antique Preservers Association | Milton |
| Ontario Track 3 Adaptive Sports Association | Milton |
| Ontario Trillium Foundation | Toronto |
| Ontario Women's Justice Network | Toronto |
| Ontario. Elections Ontario, Burlington Electoral District, 2025 Election | Burlington |
| Ontario. Elections Ontario, Oakville North-Burlington Electoral District, 2025 Election | Burlington |
| Ontario. Elections Ontario, Oakville Electoral District, 2025 Election | Oakville |
| Ontario. Elections Ontario | Toronto |
| Ontario. Lieutenant Governor of Ontario (Edith Dumont) | Toronto |
| Ontario. Members of Provincial Parliament, Burlington Riding, Provincial Constituency Office – Natalie Pierre | Burlington |
| Ontario. Members of Provincial Parliament, Milton Riding, Provincial Constituency Office - Zee Hamid | Milton |
| Ontario. Members of Provincial Parliament, Oakville North-Burlington Riding, Provincial Constituency Office - Effie Triantafilopoulos | Oakville |
| Ontario. Members of Provincial Parliament, Oakville Riding, Provincial Constituency Office - Stephen Crawford | Oakville |
| Ontario. Members of Provincial Parliament, Wellington-Halton Hills Riding, Provincial Constituency Office - Ted Arnott | Centre Wellington |
| Ontario. Ministry for Seniors and Accessibility | Toronto |
| Ontario. Ministry of Agriculture, Food and Agribusiness, Guelph - Provincial Headquarters | Guelph |
| Ontario. Ministry of Children, Community and Social Services, Burlington - Itabashi Way, Ontario Disability Support Program | Burlington |
| Ontario. Ministry of Children, Community and Social Services, Burlington - Fairview St, Youth Justice Services | Burlington |
| Ontario. Ministry of Children, Community and Social Services, Mississauga | Mississauga |
| Ontario. Ministry of Children, Community and Social Services, Ontario Autism Program | Toronto |
| Ontario. Ministry of Children, Community and Social Services, Post Adoption Disclosure Unit | Toronto |
| Ontario. Ministry of Children, Community and Social Services, Private and International Adoption | Toronto |
| Ontario. Ministry of Children, Community and Social Services, Special Services, Enhanced Respite and Assistance for Children with Disabilities, Mississauga | Mississauga |
| Ontario. Ministry of Children, Community and Social Services | Toronto |
| Ontario. Ministry of Children, Community and Social Services, Welfare Fraud Hotline | Toronto |
| Ontario. Ministry of Children, Community and Social Services. Family Responsibility Office | Toronto |
| Ontario. Ministry of Children, Community and Social Services. Support Services for Male Survivors of Sexual Abuse Program | Toronto |
| Ontario. Ministry of Children, Community and Social Services. Victim Support Line | Toronto |
| Ontario. Ministry of Colleges and Universities - Student Financial Assistance Branch, Student Financial Assistance | Thunder Bay |
| Ontario. Ministry of Education, Trillium Demonstration School | Milton |
| Ontario. Ministry of Education | Toronto |
| Ontario. Ministry of Environment, Conservation and Parks, Peterborough - Mailing Address, Natural Resources Information and Support Centre | Peterborough |
| Ontario. Ministry of Finance, Objections and Tax Appeals | Oshawa |
| Ontario. Ministry of Finance, Oshawa, Guaranteed Annual Income System | Oshawa |
| Ontario. Ministry of Francophone Affairs, Ministry of Francophone Affairs | Toronto |
| Ontario. Ministry of Government and Consumer Services. Consumer Protection Ontario | Toronto |
| Ontario. Ministry of Health, Public Health Care | Toronto Downtown Central |
| Ontario. Ministry of Health, Trillium Drug Program | Etobicoke |
| Ontario. Ministry of Health, Health Care Connect | Toronto Downtown Central |
| Ontario. Ministry of Health, Health811 | Toronto Downtown Central |
| Ontario. Ministry of Health, MedsCheck | Toronto Downtown Central |
| Ontario. Ministry of Health, Ontario's Fertility Program | Toronto Downtown Central |
| Ontario. Ministry of Health, Refugee HealthLine | Toronto Downtown Central |
| Ontario. Ministry of Health, Sexual Health Infoline Ontario | Toronto Downtown |
| Ontario. Ministry of Health, Smoking Cessation Program | Toronto Downtown Central |
| Ontario. Ministry of Health, Online Service, Find a naxolone kit | Ontario |
| Ontario. Ministry of Health, Assistive Devices Program | North York Central |
| Ontario. Ministry of Health, Home Oxygen Therapy | North York Central |
| Ontario. Ministry of Health, Ontario Public Drug Programs | Etobicoke |
| Ontario. Ministry of Health, Ontario Health Insurance Plan | Toronto Downtown Central |
| Ontario. Ministry of Health, Dental Care For Low-Income Seniors | Toronto |
| Ontario. Ministry of Health, Medical assistance in dying and end-of-life decisions | Toronto Downtown Central |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Halton Region Office, Apprenticeship Office | Oakville |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, e-Channel | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Apprenticeship Office, Peel Region Office | Mississauga |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Employment Ontario Contact Centre | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Ontario Bridge Training Program | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Toronto - No Physical Address, Adjustment Advisory Program | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Toronto - University Ave, Global Experience Ontario | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch, Central Region West, Mississauga | Mississauga |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch, Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch, Main Office | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Mediation Services | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Occupational Health and Safety Branch | Toronto |
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Ontario Immigrant Nominee Program | Toronto |
| Ontario. Ministry of Long-Term Care, Long-Term Care Family Support and Action Line | Toronto Downtown Central |
| Ontario. Ministry of Long-Term Care, Online service, Find a long-term care home in Ontario | Ontario |
| Ontario. Ministry of Long-Term Care, Reports on Long-Term Care Homes | Toronto Downtown Central |
| Ontario. Ministry of Municipal Affairs and Housing. Disaster Recovery Assistance for Ontarians | Toronto |
| Ontario. Ministry of Municipal Affairs and Housing. Rental Housing Enforcement Unit | Toronto |
| Ontario. Ministry of Public and Business Service Delivery and Procurement. Insurance and Claims Services Branch, Motor Vehicle Accident Claims Fund | Toronto |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Ontario Court of Justice - Criminal Court | Milton |
| Ontario. Ministry of the Attorney General, Burlington, Ontario Court of Justice - Criminal Court | Burlington |
| Ontario. Ministry of the Attorney General, Burlington, Ontario Court of Justice - Criminal Youth Court | Burlington |
| Ontario. Ministry of the Attorney General, Burlington, Superior Court of Justice - Small Claims Court | Burlington |
| Ontario. Ministry of the Attorney General, Hamilton - John Sopinka Courthouse, Ontario Court of Justice - Criminal Youth Court | Hamilton Central |
| Ontario. Ministry of the Attorney General, Independent Legal Advice for Survivors of Sexual Assault Program | Toronto |
| Ontario. Ministry of the Attorney General, Milton Courthouse - Rm 235, Victim / Witness Assistance Program | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Ontario Court of Justice - Criminal Youth Court | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Ontario Court of Justice - Family Court | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Superior Court of Justice - Civil Court | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Superior Court of Justice - Criminal Court | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Superior Court of Justice - Family Court | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Superior Court of Justice - Family Court - On Site Mediation Services | Milton |
| Ontario. Ministry of the Attorney General, Milton Courthouse, Superior Court of Justice - Small Claims Court | Milton |
| Ontario. Ministry of the Attorney General, Superior Court of Justice - Family Court - Off Site Mediation Services | Oakville |
| Ontario. Ministry of the Attorney General, Victim / Witness Assistance Program, Toronto, Court of Appeal of Ontario | Toronto |
| Ontario. Ministry of the Attorney General, Victim / Witness Assistance Program, Toronto, Ontario Review Board | Toronto |
| Ontario. Ministry of the Attorney General, Toronto, Ontario Land Tribunal | Toronto |
| Ontario. Ministry of the Attorney General, Court Services, Juror Support Program | Toronto |
| Ontario. Ministry of the Attorney General, Hamilton Services, Family Court - Litigation Department | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, Hamilton Courthouse, Family Court | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, Family Law Information Centre | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, Hamilton Courthouse, On-Site Mediation Services | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, John Sopinka Courthouse, Criminal Court | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, John Sopinka Courthouse, Enforcement Office | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, John Sopinka Courthouse, Ontario Victim/Witness Assistance Program | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, John Sopinka Courthouse, Small Claims Court | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, Office of the Public Guardian and Trustee (OPGT) - Guardianship Investigations | Hamilton |
| Ontario. Ministry of the Attorney General, Hamilton Services, Office of the Public Guardian and Trustee | Hamilton |
| Ontario. Ministry of the Attorney General. Justice Ontario, Toronto | Toronto |
| Ontario. Ministry of the Attorney General. Office of the Children's Lawyer | Toronto |
| Ontario. Ministry of the Attorney General. Office of the Public Guardian and Trustee | Toronto |
| Ontario. Ministry of the Environment, Conservation and Parks, Halton-Peel MECP District | Burlington |
| Ontario. Ministry of the Environment, Conservation and Parks, Bronte Creek Provincial Park | Oakville |
| Ontario. Ministry of the Environment, Conservation and Parks, Ontario Parks | Peterborough |
| Ontario. Ministry of the Environment, Conservation and Parks, Public Information Centre | Toronto |
| Ontario. Ministry of the Environment, Conservation and Parks, Spills Action Centre | Toronto |
| Ontario. Ministry of the Solicitor General, Milton Mall, Probation and Parole | Milton |
| Ontario. Ministry of the Solicitor General, Central West Office - Mailing Address, Office of the Chief Coroner | Halton Region |
| Ontario. Ministry of the Solicitor General, Georgetown Office, Probation and Parole | Georgetown |
| Ontario. Ministry of the Solicitor General, Vanier Centre for Women | Milton |
| Ontario. Ministry of the Solicitor General, Maplehurst Correctional Complex | Milton |
| Ontario. Ministry of the Solicitor General, Oakville - South Halton Office, Probation and Parole | Oakville |
| Ontario. Ministry of the Solicitor General | Toronto |
| Ontario. Ministry of the Solicitor General, Animal Abuse Hotline | Toronto |
| Ontario. Ministry of the Solicitor General, Emergency Management Ontario | Toronto |
| Ontario. Ministry of the Solicitor General, Office of the Chief Coroner | Toronto |
| Ontario. Ministry of Tourism, Culture and Sport, Ontario Travel Information Centre - Toronto | Toronto |
| Ontario. Ministry of Transportation, Senior Driver Renewal Program | Halton Region |
| Ontario. Ministry of Transportation, Tow Zone Pilot Program | Ontario |
| Ontario. Ministry of Transportation, Traveller's Information | Ontario |
| Ontario. Office of the Employer Adviser, Head Office | Toronto |
| Ontario. Office of the Worker Adviser, Mississauga Office, Ontario. Office of the Worker Adviser, Mississauga Office | Mississauga |
| Ontario. Pay Equity Commission, Ontario Pay Equity Commission | Toronto |
| Ontario. Premier (Doug Ford), Toronto | Toronto |
| Operation Come Home, Reunite Program | Ottawa |
| Optician On Wheels, Mobile Optometrist | Etobicoke Central |
| Optimal Health Pharmacy, Burlington, Pharmacy Services | Burlington |
| Optimist Club of Burlington | Burlington |
| Optimist Club of Halton Hills | Georgetown |
| Optimist Club of Milton | Milton |
| Optimist Club of Oakville | Oakville |
| Orange Seeds Montessori Centre, Licensed Child Care Centre | Oakville |
| Orchard Children's Centre (The), Licensed Child Care Centre | Burlington |
| Order of the Eastern Star, Milton - Halton Chapter 280, Service Club | Milton |
| Origins Pharmacy, Milton, Pharmacy Services | Milton |
| Origins Pharmacy and Compounding Lab, Oakville - 3075 Hospital Gate, Pharmacy Services | Oakville |
| Origins Pharmacy and Home Health Care Centre, Pharmacy Services | Oakville |
| Oshi's Daycare, Licensed Child Care Centre | Oakville |
| Osteoporosis Canada | North York East |
| Ostomy Canada Society, Halton/Peel Peer Support Group | Oakville |
| Ostomy Resources | Mississauga |
| Our Kids Network | Halton Region |
| Our Kids Network, Halton Youth Initiative | Halton Region |
| Our Little Angels Academy Licensed Home Child Care Agency, Licensed Home Child Care Agency | Milton |
| Our Place Peel, Emergency Youth Shelter (Brampton) | Brampton |
| Our Place Peel, Emergency Youth Shelter (Mississauga) | Mississauga |
| Outward Bound Canada, Toronto, Charitable Programs | Toronto |
| Ovarian Cancer Canada | North York Central |
| Overeaters Anonymous, Oakville / Burlington Area Meetings | Burlington |
