| Cabbagetown Women's Clinic | Toronto Downtown East |
| Calea | Mississauga |
| Calvary Burlington | Burlington |
| Calvary Chapel Oakville | Oakville |
| Cama Woodlands, Long Term Care Home | Burlington |
| Camelot Centre, Adult Day Program | Burlington |
| Camp Quality Canada, Camp Quality Southern Ontario, Camp for Children with Cancer and Blood Disorders | Toronto |
| Campbellville Pharmacy, Pharmacy Services | Milton |
| Canada Border Services Agency. Immigration Holding Centre | Toronto |
| Canada Mortgage and Housing Corporation [Toronto area], Ontario Business Centre, Affordable Housing - Indigenous and the North Housing Solutions | Toronto |
| Canada Mortgage and Housing Corporation, Ontario | Toronto |
| Canada Post, Online Service, Find a Post Office | Ontario |
| Canada Post Corporation, Acton Post Office, Postal Services | Acton |
| Canada Post Corporation, Georgetown Post Office, Postal Services | Georgetown |
| Canada Post Corporation, Burlington Post Office, Postal Services | Burlington |
| Canada Post Corporation, Milton Post Office, Postal Services | Milton |
| Canada Post Corporation, Campbellville Post Office, Postal Services | Milton |
| Canada Post Corporation, Oakville - Lakeshore West Post Office, Postal Services | Oakville |
| Canada Post Corporation, Nunavut, Letters to Santa Claus | |
| Canada Safety Council, Ottawa | Ottawa |
| Canada. Bank of Canada, Unclaimed Properties Office | Ottawa (City of) |
| Canada. Border Services Agency, NEXUS Program | Niagara Falls |
| Canada. Border Services Agency, Border Information Service | Ottawa |
| Canada. Business Development Bank of Canada, Canada. Business Development Bank of Canada, Ottawa | Ottawa |
| Canada. Canada Learning Bond | Gatineau |
| Canada. Canada Mortgage and Housing Corporation | Ottawa |
| Canada. Canada Pension Plan | Toronto |
| Canada. Canada Revenue Agency, Tax Information | Canada |
| Canada. Canada Revenue Agency, Registered Disability Savings Plan (RDSP) | |
| Canada. Canada Revenue Agency, Canada Dental Benefit | Ottawa |
| Canada. Canada Revenue Agency, Charities Directorate | |
| Canada. Canada Revenue Agency, Sir Isaac Brock Building, Hamilton Tax Services | Hamilton |
| Canada. Canada Revenue Agency, Toronto Region, Canada Child Benefit | Toronto |
| Canada. Canada Revenue Agency, Toronto Region, Taxes and benefits | Toronto |
| Canada. Canadian Centre for Occupational Health and Safety, Safety Info Line | Hamilton |
| Canada. Canadian Food Inspection Agency, Ontario Area Office | Guelph |
| Canada. Canadian Heritage, Youth Exchanges Canada - Youth Forums Canada | Gatineau |
| Canada. Canadian Heritage | Gatineau |
| Canada. Canadian Intellectual Property Office, Patents | Gatineau |
| Canada. Canadian Radio-television and Telecommunications Commission, Spam Reporting Centre | Ottawa |
| Canada. Canadian Radio-television and Telecommunications Commission | Ottawa |
| Canada. Competition Bureau, Information Centre | Gatineau |
| Canada. Crown-Indigenous Relations and Northern Affairs and Indigenous Services, Allegations and Complaints | Gatineau |
| Canada. Department for Women and Gender Equality | Gatineau |
| Canada. Department of Justice, Child Support Guidelines | Ottawa |
| Canada. Elections Canada | Gatineau |
| Canada. Employment and Social Development Canada, Job Bank | Ottawa |
| Canada. Employment and Social Development Canada. Toronto District Office, Labour Program | Toronto |
| Canada. Employment Insurance | Toronto |
| Canada. Financial Consumer Agency of Canada, Ottawa, Cashing a Government of Canada Cheque | Ottawa |
| Canada. Global Affairs Canada, Essential Information for Canadian Travellers | Ottawa |
| Canada. Governor General of Canada | Ottawa |
| Canada. Health Canada | Ottawa (City of) |
| Canada. Health Canada, Drugs and Health Products - Cannabis for Medical Purposes | Ottawa |
| Canada. Health Canada, Ontario Region, First Nations and Inuit Health Branch | Ottawa |
| Canada. Health Canada, Ontario Region, Non-Insured Health Benefits | Ottawa |
| Canada. Health Canada, Cannabis in Canada | Ottawa |
| Canada. Immigration, Refugees and Citizenship Canada, Passport Office, Brampton Branch | Brampton |
| Canada. Immigration, Refugees and Citizenship Canada, Passport Office, Mississauga Branch | Mississauga |
| Canada. Immigration, Refugees and Citizenship Canada, Greater Toronto Area, Citizenship and Immigration Centre, Mississauga office | Mississauga |
| Canada. Indigenous Services Canada, Indian Residential Schools Settlement Agreement - Health Supports Call Centres | Gatineau |
| Canada. Indigenous Services Canada, Indian Residential Schools Settlement Agreement | Gatineau |
| Canada. Indigenous Services Canada | Toronto |
| Canada. Indigenous Services Canada - Northern Ontario, Jordan's Principle | Toronto |
| Canada. Innovation, Science and Economic Development Canada, Gatineau, Canadian Intellectual Property Office | Gatineau |
| Canada. Innovation, Science and Economic Development Canada, Canadian Consumer Handbook | Ottawa |
| Canada. Innovation, Science and Economic Development Canada, Corporations Canada - Business Incorporation | Ottawa |
| Canada. Innovation, Science and Economic Development Canada, Spectrum and Telecommunications Sector - Amateur Radio Service Centre | |
| Canada. Innovation, Science and Economic Development, Ontario Region, Toronto, Office of the Superintendent of Bankruptcy, Ontario Region | Toronto |
| Canada. Library and Archives Canada | Ottawa |
| Canada. Members of Parliament, Milton Electoral District, Federal Constituency Office - Adam van Koeverden | Milton |
| Canada. Members of Parliament, Burlington Electoral District, Federal Constituency Office - Karina Gould | Burlington |
| Canada. Members of Parliament, Oakville North-Burlington Electoral District, Federal Constituency Office - Pam Damoff | Halton Region |
| Canada. Members of Parliament, Oakville Electoral District, Federal Constituency Office - Anita Anand | Oakville |
| Canada. Members of Parliament, Wellington-Halton Hills - Fergus Office, Federal Services to Constituents | Centre Wellington |
| Canada. National Defence, Canadian Forces Member Assistance Program | Ottawa |
| Canada. Natural Resources Canada, Office of Energy Efficiency | Ottawa |
| Canada. Office of the Federal Ombudsperson for Victims of Crime | Ottawa |
| Canada. Office of the Information Commissioner of Canada | Ottawa |
| Canada. Office of the Prime Minister | Ottawa |
| Canada. Office of the Privacy Commissioner of Canada, Ottawa | Ottawa |
| Canada. Old Age Security Programs | Toronto |
| Canada. Parks Canada | Gatineau |
| Canada. Parliament of Canada, Ottawa, Visitor Information | Ottawa |
| Canada. Royal Canadian Mounted Police, National Security Information Network | Ottawa |
| Canada. Social Insurance Numbers, Toronto | Toronto |
| Canada. Statistics Canada, Statistical Information Services | Ottawa |
| Canada. Transport Canada, Pleasure Craft Licensing and Proof of Competency | Halton Region |
| Canada. Transport Canada, Pleasure Craft Licensing Centre | Ottawa |
| Canada. Veterans Affairs Canada [Toronto area], Bureau of Pensions Advocates, Toronto, Scarborough Service Centre | Toronto |
| Canada. Veterans Affairs Canada [Toronto area], Mississauga Service Centre | Mississauga |
| Canada. Veterans Affairs Canada [Toronto area], Veterans Ombudsman | Toronto |
| Canada. Veterans Review and Appeal Board, Charlottetown | Charlottetown |
| Canadian Abilities Foundation | Cobourg |
| Canadian Academy of Dental Health and Community Sciences - Division of the Canadian Academy of Dental Hygiene, Dental Hygiene Clinic | Mississauga |
| Canadian Addison Society (The) | Etobicoke Central |
| Canadian Alliance of British Pensioners | Toronto |
| Canadian Alopecia Areata Foundation | King Township |
| Canadian Anti-Fraud Centre | North Bay |
| Canadian Association for Girls in Science, Oakville Chapter - Mailing Address | Oakville |
| Canadian Association of Retired Persons, Toronto | Toronto |
| Canadian Association of the Deaf | Ottawa |
| Canadian Automobile Association, South Central Ontario - Burlington Office | Burlington |
| Canadian Automobile Association, South Central Ontario - Oakville Office | Oakville |
| Canadian Bar Association (The), Pro Bono Initiative - Crisis in Ukraine | Ottawa |
| Canadian Blood Services, Halton | Halton Region |
| Canadian Breast Cancer Network | Ottawa |
| Canadian Cancer Society - Ontario Division | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division, Cancer Information Service | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division, Smokers' Helpline | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division, Breast Cancer Support and Information Team | Toronto Downtown North |
| Canadian Cancer Society - Ontario Division - Peer Match Program, Canadian Cancer Society - Ontario Division | Toronto Downtown North |
| Canadian Caribbean Association of Halton, Cultural Heritage Group | Oakville |
| Canadian Centre for Child Protection Inc | Winnipeg |
| Canadian Centre for Housing Rights, Eviction Prevention and Tenant Services | Toronto |
| Canadian Centre for Men and Families, Canadian Centre for Men and Families - Toronto | Toronto |
| Canadian Centre for Victims of Torture, Counselling and Support Services, Mississauga Office | Mississauga |
| Canadian Centre on Substance Use and Addiction, Ottawa | Ottawa |
| Canadian Centre to End Human Trafficking, Canadian Human Trafficking Hotline | Toronto |
| Canadian Civil Liberties Association | Toronto |
| Canadian Club of Halton | Oakville |
| Canadian Coalition for Seniors' Mental Health | Markham |
| Canadian Council on Rehabilitation and Work | Toronto |
| Canadian Counselling and Psychotherapy Association | Ottawa |
| Canadian Croatian Choral Society | Oakville |
| Canadian Dental Care Plan | Thunder Bay |
| Canadian Digestive Health Foundation | Oakville |
| Canadian Environmental Law Association, Toronto | Toronto |
| Canadian Families and Corrections Network, Kingston - Mailing Address | |
| Canadian Federation of Students | Ottawa |
| Canadian Federation of University Women, Burlington Chapter | Burlington |
| Canadian Federation of University Women, Milton and District Chapter - Mailing Address | Milton |
| Canadian Feed The Children | Toronto |
| Canadian Forces Morale and Welfare Services, Support Our Troops Fund | Ottawa |
| Canadian Guide Dogs for the Blind | Ottawa |
| Canadian Hard of Hearing Association, Canadian Hard of Hearing Association Advocacy and Support Groups | |
| Canadian Hard of Hearing Association, Ottawa, Canadian Hard of Hearing Association, Ottawa | Ottawa |
| Canadian Hearing Services, Hamilton Regional Office, Canadian Hearing Services, Canadian Hearing Services Support Groups and Counselling | Hamilton |
| Canadian Hearing Services - Toronto and York Region, Canadian Hearing Services, Mississauga Regional Office | Mississauga |
| Canadian Hearing Services - Toronto and York Region, Canadian Hearing Services, Toronto Regional Office | Toronto |
| Canadian Hemophilia Society, Toronto and Central Ontario Region, Blood Disorders Information and Support | Scarborough North |
| Canadian Home Healthcare, Sleep Apnea Therapy and Home Oxygen | Oakville |
| Canadian Human Rights Commission | Ottawa |
| Canadian Indian Association of Halton Region, Cultural Heritage Group | Oakville |
| Canadian Information Centre for International Credentials | Toronto |
| Canadian Institute for Conflict Resolution | Ottawa |
| Canadian Internet Policy and Public Interest Clinic | Ottawa |
| Canadian Italian Family Assistance Association, Toronto | Toronto |
| Canadian Japanese Cultural Centre of Hamilton, Canadian Japanese Cultural Centre of Hamilton Programs | Hamilton |
| Canadian Labour Congress, Ontario Regional Office | Toronto |
| Canadian Liver Foundation, Markham - National Office and Toronto/GTA Chapter | Markham |
| Canadian Marketing Association | Toronto |
| Canadian Memorial Chiropractic College, Bronte Harbour Chiropractic Clinic | Oakville |
| Canadian Mental Health Association, Halton Region Branch Head Office - Oakville, Mental Health Services | Oakville |
| Canadian Mental Health Association, Halton Region Branch - Milton Office, Mental Health Services | Milton |
| Canadian Mental Health Association, Education and Training | Oakville |
| Canadian Mental Health Association, Mobile Outreach Team - COAST | Oakville |
| Canadian Mental Health Association, Free Call-In Counselling | Halton Region |
| Canadian Mental Health Association, York Region and South Simcoe, CMHA Vaughan, BounceBack Ontario | Vaughan |
| Canadian Motor Vehicle Arbitration Plan | Toronto |
| Canadian Organization for Rare Disorders | Toronto Downtown Central |
| Canadian Paediatric Society, Caring for Kids | Ottawa |
| Canadian Parents of Murdered Children and Survivors of Homicide Victims | Ottawa |
| Canadian Power and Sail Squadrons, Niagara District - Burlington Power and Sail Squadron | Burlington |
| Canadian Power and Sail Squadrons, Oakville Power and Sail Squadron | Oakville |
| Canadian Red Cross, Burlington Branch | Burlington |
| Canadian Red Cross, Halton and Peel Regional Office | Mississauga |
| Canadian Red Cross, Burlington Branch, Meals on Wheels | Burlington |
| Canadian Red Cross, Burlington Branch, Transportation | Burlington |
| Canadian Red Cross, Halton and Peel Regional Office, Emergency and Disaster Services | Mississauga |
| Canadian Red Cross, Halton and Peel Regional Office, First Aid and CPR | Mississauga |
| Canadian Red Cross, Halton and Peel Regional Office, Ontario Friendly Calls Program | Mississauga |
| Canadian Red Cross, Halton and Peel Regional Office, Violence, Bullying and Abuse Prevention | Mississauga |
| Canadian Resource Centre for Victims of Crime | Ottawa |
| Canadian Snowbird Association | Toronto |
| Canadian Spondyloarthritis Association | Toronto Downtown |
| Canadian Therapeutic Riding Association | Guelph |
| Canadian Tire Jumpstart, Toronto - Provincial Office, Recreation Expense Assistance | Toronto |
| Canadian Tire Jumpstart, Halton Hills Chapter, Recreation Expense Assistance | Halton Hills |
| Canadian Ukrainian Immigrant Aid Society, Toronto - Main Office | Toronto |
| Canadian Veterinary Medical Association | Ottawa |
| Canadian Virtual Hospice | Winnipeg |
| Cancer Assistance Services of Halton Hills | Halton Hills |
| CANES Community Care, Ride Connect | Toronto |
| CANES Community Care, CANES at Home Transitional Care Program | Toronto |
| Cangrands National Kinship Support, Mailing Address | Saskatchewan |
| Cannaway Clinic, Medical Cannabis | Oakville |
| Capability Support Services, Community Outreach Services | Burlington |
| Capability Support Services, Burlington - Aldershot Village, Supportive Housing | Burlington |
| Capability Support Services, Burlington - Carey House, Shared Living | Burlington |
| Capability Support Services, VIS-ABLE Program | Burlington |
| Car Pool Lots, Halton Region | Halton Region |
| CARE Centre for Internationally Educated Nurses, CARE Centre Toronto | Toronto |
| CARE Centre for Internationally Educated Nurses, CARE Centre Toronto, Ontario Bridge Training Program | Toronto |
| Care Connections of Halton Hills | Halton Hills |
| Care for Life Support Services, Specialized Supports for Older Adults | Burlington |
| Career Edge Organization | Toronto |
| Carefree HomeCare Plus, Mississauga, In Home Care Services | Erindale |
| caregiverexchange.ca | London |
| CareLink Advantage | Milton |
| CareNow Ontario | North York West |
| CarePartners, In-Home Care Services | Mississauga |
| CarePoint Health, Mississauga, Ontario Structured Psychotherapy Program | Mississauga |
| CareRx SmartMeds Pharmacy, Pharmacy Services | Burlington |
| Caroline Family Health Team | Burlington |
| Caroline Family Health Team, Diabetes Education Program | Burlington |
| CARP, Halton Chapter | Burlington |
| Carpenter Hospice | Burlington |
| Carruthers Road Cooperative Homes | Georgetown |
| Catalyst | Oakville |
| Catalyste+, Toronto | Toronto |
| Catholic Children's Aid Society of Hamilton, Catholic Children's Aid Society of Hamilton Adoption and Fostering Services | Hamilton |
| Catholic Crosscultural Services, Catholic Crosscultural Services, Mississauga - 4557 Hurontario St Site | Mississauga |
| Catholic Women's League Holy Rosary Milton, Milton | Milton |
| CATIE (Canadian AIDS Treatment Information Exchange) | Toronto Downtown Central |
| CATIE (Canadian AIDS Treatment Information Exchange), Where To? | Toronto Downtown Central |
| CBI Health, Driver Assessment Services | Burlington |
| CBI Home Health, In Home Care Services | Mississauga |
| CCF for PSP Awareness, Burlington, Support Group | Burlington |
| Cedar Springs Ski Club | Burlington |
| Celiac Canada | Mississauga |
| Cemeteries, Crematoria and Interment of Ashes - Burlington and Area | Burlington |
| Central Baptist Church | Oakville |
| Central Registry | Oakville |
| Central Registry, Adult Day Programs | Oakville |
| Central Registry, Caregiver ReCharge | Oakville |
| Central Registry, Food Support Programs | Oakville |
| Central Registry, Supports for Daily Living | Oakville |
| Central Registry, Temporary short stays out-of-home | Oakville |
| Central West Specialized Developmental Services, Developmental Services | Oakville |
| Central West Specialized Developmental Services, Halton Support Services | Oakville |
| Central West Specialized Developmental Services, Respite Services | Oakville |
| Centre Copains-Copines, Licensed Child Care Centre | Burlington |
| Centre de Santé Communautaire Hamilton/Niagara, Centre de Santé Communautaire Canada Prenatal Nutrition Program | Hamilton |
| Centre for Addiction and Mental Health, Back On Track Mail Address, Back On Track Remedial Measures Program | Toronto |
| Centre for Addiction and Mental Health, Shkaabe Makwa Centre for First Nations, Inuit and Métis Wellness | Toronto |
| Centre for Addiction and Mental Health, CAMH Support Resources and Information Services | Toronto |
| Centre for Addiction and Mental Health, Addiction Medicine Services and Specialized Clinics | Toronto |
| Centre for Compassion & Wisdom | Burlington |
| Centre for Diverse Learners | Burlington |
| Centre for Skills Development, Burlington - South Service Rd | Burlington |
| Centre for Skills Development, Burlington - Appleby Line, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Burlington |
| Centre for Skills Development, Burlington - North Service Rd, Skilled Trades Training Programs | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Doorways - Literacy and Basic Skills | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Integrated Employment Services | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Rental Facilities | Burlington |
| Centre for Skills Development, Burlington - South Service Rd, Services for Employers | Burlington |
| Centre for Skills Development, Milton - Ontario St S - Suite 208, Integrated Employment Services | Milton |
| Centre for Skills Development, Milton - Ontario St S - Unit 15, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Milton |
| Centre for Skills Development, Oakville - Abbeywood Dr, LINC (Language Instruction for Newcomers to Canada) and Immigrant Services | Oakville |
| Centre for Skills Development, Oakville - Morden Rd, Integrated Employment Services | Oakville |
| Centre for Spanish-Speaking Peoples, Legal Clinic, Toronto - Jane St | Toronto |
| Certified Listeners Society | Burlington |
| CFUW Georgetown, Georgetown Chapter | Georgetown |
| CFUW Oakville | Oakville |
| Chai Lifeline Canada | Toronto |
| Challenge Golf | Oakville |
| Chance to Play | Halton Hills |
| CharityVillage.com | Milton |
| Charm Fertility, Centre for Human Assisted Reproductive Medicine | Oakville |
| CharterAbility | Oakville |
| Chartwell Baptist Community Homes, Prince Charles Place | Oakville |
| Chartwell Christopher Terrace Retirement Residence | Burlington |
| Chartwell Church | Oakville |
| Chartwell House Early Learning Centre (The), Licensed Child Care Centre | Oakville |
| Chartwell Lakeshore Retirement Residence | Burlington |
| Chartwell Martha's Landing Retirement Residence | Burlington |
| Chartwell Oakville Retirement Residence, Oakville - Oak Park Blvd | Oakville |
| Chartwell Waterford Retirement Residence, Oakville - Baronwood Dr | Oakville |
| Chartwell-Maple Grove Residents Association | Oakville |
| Chatting to Wellness | Toronto |
| Chautauqua Cooperative Homes | Oakville |
| Chez Pharmacy, Pharmacy Services | Burlington |
| Chiefs of Ontario, Administration | Toronto |
| Child Abuse and Neglect Reporting, Halton Region | Halton Region |
| Child and Family Services Review Board | Toronto |
| Child and Parent Resource Institute (CPRI) | London |
| Childhood Cancer Canada | Toronto Downtown Central |
| Children and Youth Grief Network | Peel Region |
| Children's Bridge (The) | Ottawa |
| Children's Mental Health Ontario | Toronto |
| Children's Resource and Consultation Centre of Ontario | Toronto |
| Childventures Early Learning Academy, Burlington, Licensed Child Care Centre | Burlington |
| Childventures Early Learning Academy, Milton, Licensed Child Care Centre | Milton |
| Childventures Early Learning Academy, Oakville, Licensed Child Care Centre | Oakville |
| Chinese and Southeast Asian Legal Clinic | Toronto |
| Chinese Association of Mississauga, Mississauga | Mississauga |
| Chinmaya Mission Halton Region | Milton |
| Chisholm Academy | Oakville |
| Christian and Missionary Alliance, Burlington - Central Canadian District Office | Burlington |
| Christie Oaks Care Home, Acton | Acton |
| Church of Jesus Christ of Latter Day Saints (The), Family History Centre | Hamilton |
| Church of Jesus Christ of Latter-day Saints (The), Burlington Ward | Burlington |
| Church of Jesus Christ of Latter-day Saints (The), Oakville Ward | Oakville |
| Church of St George and St Abanoub | Milton |
| Church of St Matthew on the Plains | Burlington |
| Church of the Epiphany | Oakville |
| Churchill Community Church | Acton |
| Circle of Friends Tai Chi Club | Milton |
| Circle of Harmony Chorus | Oakville |
| Circulate Cardiac & Vascular Centre | Burlington |
| City of Hamilton, Planning and Economic Development Department, Tourism and Culture Division, Tourism Hamilton, Visitor Information Centre | Hamilton |
| Civilian Review and Complaints Commission for the RCMP | Ottawa |
| Civitan Club of Oakville | Oakville |
| Civitan Club of Oakville, Civitan Dorval Crossing Farmers Market | Oakville |
| Clanmore Montessori School | Oakville |
| Clanmore Montessori School, Licensed Child Care Centre | Oakville |
| Classic Book Club | Oakville |
| Cleaning For A Reason | |
| Clear View Pharmacy, Pharmacy Services | Oakville |
| CLEAResult Canada, Central East, Enbridge Home Winterproofing and IESO Energy Affordability Programs | Toronto |
| Clearpoint Pharmacy and Compounding Services, Pharmacy Services | Burlington |
| ClearView Church | Oakville |
| Clearview Oakville Community Alliance | Oakville |
| CLEO | Toronto |
| CLEO, Steps to Justice | Toronto |
| Closing the Gap Healthcare, In Home Care Services | Mississauga |
| CNIB, Toronto Region, Impaired Vision Information and Support | North York Central |
| CNIB, Toronto Region, Deafblind Community Services | North York Central |
| Cobblehill Homes Cooperative, Acton | Acton |
| Cocaine Anonymous | Toronto Downtown Central |
| Cogeco Connexion, Milton/Halton Hills, YourTV Community Programming - Cable 700, Channel 100 on Epico | Halton Hills |
| Cogeco Connexion, Burlington / Oakville, YourTV Community Programming - Cable 700 or 100 on Epico | Burlington |
| Cogir Senior Living, Appleby Place Retirement Home | Burlington |
| Cogir Senior Living, The Williamsburg Retirement Home | Burlington |
| Cogir Senior Living, Trafalgar Lodge Retirement Home | Oakville |
| Colleen's Care Company | Oakville |
| College of Audiologists and Speech Language Pathologists of Ontario | Toronto Downtown North |
| College of Chiropractors of Ontario | Toronto Downtown Central |
| College of Dental Hygienists of Ontario | Toronto Downtown Central |
| College of Denturists of Ontario | Toronto Downtown Central |
| College of Dietitians of Ontario | Toronto |
| College of Early Childhood Educators | Toronto |
| College of Homeopaths of Ontario | Toronto Downtown Central |
| College of Immigration and Citizenship Consultants | Burlington |
| College of Massage Therapists of Ontario | Toronto Downtown North |
| College of Midwives of Ontario | Toronto Downtown North |
| College of Naturopaths of Ontario (The) | Toronto Downtown Central |
| College of Nurses of Ontario | Toronto Downtown North |
| College of Occupational Therapists of Ontario | Toronto Downtown Central |
| College of Opticians of Ontario | Toronto Downtown Central |
| College of Optometrists of Ontario | Toronto Downtown North |
| College of Physicians and Surgeons of Ontario | Toronto Downtown Central |
| College of Physiotherapists of Ontario | Toronto Downtown Central |
| College of Psychologists of Ontario (The) | Toronto Downtown North |
| College of Registered Psychotherapists of Ontario | Toronto Downtown |
| College of Respiratory Therapists of Ontario | Toronto Downtown Central |
| College of Traditional Chinese Medicine Practitioners and Acupuncturists of Ontario | Markham |
| College of Veterinarians of Ontario | Guelph |
| Colorectal Cancer Resource and Action Network (CCRAN) | Oakville |
| ComForCare Home Care, Halton, In Home Care Services | Milton |
| Comfort Keepers, Halton Hills, Milton and Guelph, In-Home Care Services | Halton Hills |
| Comfort Keepers, Oakville, In Home Care Services | Oakville |
| Commission for Complaints for Telecom-television Services | Ottawa |
| Communication Disabilities Access Canada | Toronto |
| Community Development Halton, Acton | Acton |
| Community Development Halton, Burlington | Burlington |
| Community Development Halton, Speakers Bureau | Halton Region |
| Community Development Halton, Volunteer Halton | Burlington |
| Community Foundation of Halton North | Milton |
| Community Living Burlington | Burlington |
| Community Living Burlington, Burlington - Lakeshore Rd, Integrated Employment Services | Burlington |
| Community Living North Halton | Milton |
| Community Living North Halton, Adult Services and Supports | Milton |
| Community Living North Halton, Services for Children and Youth | Milton |
| Community Living Oakville | Oakville |
| Community Living Oakville, Oakville - Dorval Dr, Community Connect - Day Services | Oakville |
| Community Living Oakville, Oakville - Dorval Dr, Supported Living | Oakville |
| Community Living Oakville, Integrated Employment Services | Oakville |
| Community Living Ontario | North York East |
| Community Midwives of Halton, Oakville | Oakville |
| Community Midwives of Halton, Milton | Milton |
| Community Oak Park (The), Independent Living Supports | Oakville |
| Community Rehabilitation, In-Home Physiotherapy | Lorne Park |
| Community Service Movers | Mississauga |
| Compass Community Health Centre, Diabetes Foot Care Program | Hamilton |
| Compass Point Bible Church | Burlington |
| Compass Point Bible Church, Food Market | Burlington |
| Compassion Society of Halton | Burlington |
| Compassion Society of Halton, Burlington, Food Market | Burlington |
| Compounding Centre (The), Oakville - Postmaster Dr, Pharmacy Services | Oakville |
| Concerned Friends of Ontario Citizens in Care Facilities | Toronto Downtown North |
| Connected Canadians, Technology training and support for seniors | Ottawa |
| Connected Care Halton Ontario Health Team (CCHOHT) | Oakville |
| Connected Care Halton Ontario Health Team (CCHOHT), Navigation Line | Oakville |
| Connecting Families, Internet Access for Low Income Families | Ottawa |
| ConnexOntario | London |
| ConnexOntario, Helpline | London |
| ConnexOntario, mindyourmind | London |
| Conseil scolaire catholique MonAvenir, Halton Locations, French Language Catholic Schools | Halton Region |
| Conseil scolaire catholique MonAvenir, Licensed Child Care Centre | Georgetown |
| Conseil Scolaire Viamonde, Halton Locations, French Language Public Schools | Halton Region |
| Consent and Capacity Board | Toronto |
| Conservation Halton | Burlington |
| Conservation Halton, Green Space: Newcomer Youth Climate Forum | Burlington |
| Conservation Halton, Public Education/Outreach Programs | Burlington |
| Conservation Halton, Burlington - Mount Nemo Conservation Area, Conservation Land & Recreational Trails | Burlington |
| Conservation Halton, Campbellville - Mountsberg Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Area 8 Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Crawford Lake Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Hilton Falls Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Kelso Conservation Area / Glen Eden, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Rattlesnake Point Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, Milton - Robert Edmondson Conservation Area, Conservation Land & Recreational Trails | Milton |
| Conservation Halton, School Programs | Burlington |
| Conservation Halton, Summer Camps | Burlington |
| Conservation Halton, Youth Group Programs | Burlington |
| Consolidated Credit Counselling Services of Canada | Toronto |
| Core Education and Fine Arts, Licensed Child Care Centre | Burlington |
| Cornerstone Baptist Church | Oakville |
| Cornwall Medical Clinic | Oakville |
| Cornwall Pharmacy, Pharmacy Services | Oakville |
| Coronation Park Residents Association | Oakville |
| Costco Pharmacy, Burlington - Brant St, Pharmacy Services | Burlington |
| COSTI, ArriveON App | Ontario |
| COSTI, International Student Connect | Toronto |
| COSTI, Orientation to Ontario | Toronto |
| Country Heritage Park, Food and Farm Education, Field Trip Venue, Private Tours, Heritage Venue, Event Venue and Operational Farm | Milton |
| Covenant House Toronto, Awareness and Prevention School Presentations, Toronto - Gerrard St E | Toronto |
| Covenant House Toronto, Toronto - Gerrard St E, Emergency Shelter | Toronto |
| COVID-19 Assessment Centres and Testing Options, Halton Region | Halton Region |
| COVID-19 Information, Halton Region | Halton Region |
| COVID-19 Vaccine Information, Halton Region | Halton Region |
| CPAP Central, Georgetown | Halton Hills |
| Cradle 2 Kinder Montessori & Child Care, Licensed Child Care Centre | Oakville |
| Creative Carriage | St George |
| Creative Community Hive, Burlington, Oakville and Milton, Community Crafting Sessions | Halton Region |
| Credit Canada, Oakville Office | Oakville |
| Credit Canada Debt Solutions, Credit Canada Debt Solutions, Head Office / North York Branch | Toronto |
| Credit Counselling Society, Credit Counselling Society Debt Help | Hamilton |
| Credit Counselling Society, Mississauga | Mississauga |
| Credit Counselling Society, Toronto | Toronto |
| Credit Valley Artisans | Georgetown |
| Credit Valley Conservation Authority, Limehouse Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Credit Valley Conservation Authority, Silver Creek Conservation Area, Conservation Land & Recreational Trails | Halton Hills |
| Credit Valley Diagnostic Centre | Milton |
| Crime Stoppers of Halton | Oakville |
| Croatian Folklore Ensemble Hrvatsko Prelo | Oakville |
| Croatian Social and Cultural Centre | Halton Hills |
| Crohn's and Colitis Canada | Toronto Downtown Central |
| Crohn's and Colitis Canada, Halton Region Chapter | Halton Region |
| Cross-Cultural Community Services Association, The, Cross-Cultural Community Services Association, The, TCCSA Peel Centre | Mississauga |
| Crossings Community Church | Acton |
| Crossroads International | Toronto |
| Crosstowne Church | Milton |
| Crusaders Rugby Club | Oakville |
| Crystal Care Medical Clinic, Family Practice and Walk-in | Milton |
| Crystal Care Pharmacy, Pharmacy Services | Milton |
| Cudley Corner Child Care Centre, Milton - Nipissing Rd, Licensed Child Care Centre | Milton |
| Cudley Corner Child Care Centre, Milton - Derry Rd, Licensed Child Care Centre | Milton |
| Cudley Corner Child Care Centre, Milton - Kennedy Circle, Licensed Child Care Centre | Milton |
| Cultural Interpretation Services for Our Communities | Ottawa |
| Cuso International | Ottawa |
| Custody Review Board, Toronto | Toronto |
| Custom Orthotic Design Group, Orthotic Centre at the Credit Valley Hospital | Erin Mills |
| Cyber-Seniors | |
| Cycling Without Age Hamilton & Burlington | Burlington |
| Cystic Fibrosis Canada | Toronto Downtown North |
| Cystic Fibrosis Canada, Cystic Fibrosis Canada Hamilton Chapter Location, Cystic Fibrosis Canada Hamilton Chapter Services | Hamilton |
