| Calea | Mississauga |
| Calvary Baptist Church | Burlington |
| Calvary Chapel Oakville | Oakville |
| Cama Woodlands, Long Term Care Home | Burlington |
| Campbellville Pharmacy, Pharmacy Services | Milton |
| Canada Council for the Arts | Ottawa |
| Canada. Border Services Agency, Border Information Service | Niagara Region |
| Canada. Canada Pension Plan | Toronto |
| Canada. Canada Revenue Agency, Tax Information | Canada |
| Canada. Canada Revenue Agency, Registered Disability Savings Plan (RDSP) | Ottawa |
| Canada. Canada Revenue Agency, Sir Isaac Brock Building, Hamilton Tax Services | Hamilton |
| Canada. Canada Revenue Agency, Toronto Region | Toronto |
| Canada. Elections Canada | Gatineau |
| Canada. Global Affairs Canada, Essential Information for Canadian Travellers | Ottawa |
| Canada. Health Canada, Ontario Region, First Nations and Inuit Health Branch | Ottawa |
| Canada. Health Canada, Cannabis in Canada | Ottawa |
| 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. 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 Constituency Office - Michael Chong | Centre Wellington |
| Canada. National Defence, Canadian Forces Member Assistance Program | Ottawa |
| Canada. Office of the Prime Minister | Ottawa |
| Canada. Old Age Security Programs | Toronto |
| Canada. Parks Canada | Gatineau |
| Canada. Parliament of Canada, Ottawa, Visitor Information | Ottawa |
| Canada. Veterans Affairs Canada [Toronto area], Bureau of Pensions Advocates, 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 Aboriginal AIDS Network (The) | B-Say-Tah (Resort village) |
| Canadian Academy of Dental Health and Community Sciences - Division of the Canadian Academy of Dental Hygiene, Dental Hygiene Clinic | Mississauga |
| Canadian Alliance of British Pensioners | Toronto |
| Canadian Anti-Fraud Centre | North Bay |
| 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 Breast Cancer Network | Ottawa |
| 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 | Toronto Downtown North |
| Canadian Caribbean Association of Halton, Cultural Heritage Group | Oakville |
| Canadian Centre for Housing Rights, Eviction Prevention and Tenant Support | Toronto |
| Canadian Club of Halton | Oakville |
| Canadian Coalition for Seniors' Mental Health | Markham |
| Canadian Counselling and Psychotherapy Association | Ottawa |
| Canadian Croatian Choral Society | Oakville |
| Canadian Dental Care Plan | Ontario |
| Canadian Guide Dogs for the Blind | Ottawa |
| Canadian Hard of Hearing Association, Canadian Hard of Hearing Association Hamilton Office, Canadian Hard of Hearing Association Advocacy and Support Groups | Hamilton |
| 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, Canadian Hearing Services, Mississauga Regional Office | Mississauga |
| Canadian Hearing Services, 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 Indian Association of Halton Region, Cultural Heritage Group | Oakville |
| Canadian Italian Family Assistance Association | Toronto |
| Canadian Japanese Cultural Centre of Hamilton, Canadian Japanese Cultural Centre of Hamilton Programs | Hamilton |
| Canadian Liver Foundation, National Office and Toronto/GTA Chapter | Markham |
| 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, Education and Training | Oakville |
| Canadian Mental Health Association, Mobile Outreach Team - COAST | Oakville |
| Canadian Mental Health Association, Milton and Halton Hills, Mental Health Services | Milton |
| Canadian Mental Health Association, Free Call-In Counselling | Halton Region |
| Canadian Power and Sail Squadrons, Niagara District - Burlington Power and Sail Squadron | Burlington |
| Canadian Power and Sail Squadrons, York West District - Oakville Power and Sail Squadron | Oakville |
| Canadian Red Cross, Burlington Branch | Burlington |
| Canadian Red Cross, Burlington Branch, Meals on Wheels | Burlington |
| Canadian Red Cross, Burlington Branch, Transportation | Burlington |
| Canadian Red Cross, Halton and Peel Regional Office, Ontario Friendly Calls Program | Mississauga |
| Canadian Snowbird Association | Toronto |
| Canadian Ukrainian Immigrant Aid Society, Main Office | Toronto |
| 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 |
| 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 |
| Care for Life Support Services, Psychogeriatric Supports for Older Adults | Burlington |
| Carefree HomeCare Plus, In Home Care Services | Erindale |
| caregiverexchange.ca | London |
| CareLink Advantage | Milton |
| CarePartners, In-Home Care Services | Mississauga |
| CarePartners, St Catharines | St Catharines |
| CarePoint Health, Brampton-Halton-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 |
| Catalyst | Oakville |
| CBI Health, Driver Assessment Services | Burlington |
| CBI Health (Home Health), Mississauga Traders, In Home Care Services | Mississauga |
| CCF for PSP Awareness, Burlington, Support Group | Burlington |
| Cedar Springs Ski Club | Burlington |
| 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 |
| Centre for Addiction and Mental Health, CAMH Support and Information Services | Toronto |
| Ceridian Cares | Winnipeg |
| Challenge Golf | Oakville |
| CharterAbility | Oakville |
| Chartwell Baptist Community Homes, Prince Charles Place | Oakville |
| Chartwell Christopher Terrace Retirement Residence | Burlington |
| Chartwell Church | 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 |
| Chatting to Wellness | Toronto |
| Chez Pharmacy, Pharmacy Services | Burlington |
| Chinese and Southeast Asian Legal Clinic | Toronto |
| Chinese Association of Mississauga | Mississauga |
| Chinese Canadian Community COVID-19 Project, Protech Online and Phone Support | Toronto |
| Chinmaya Mission Halton Region | Milton |
| Christie Oaks Care Home | 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 |
| Classic Book Club | Oakville |
| Cleaning For A Reason | USA |
| Clear View Pharmacy, Pharmacy Services | Oakville |
| Clearpoint Pharmacy and Compounding Services, Pharmacy Services | Burlington |
| ClearView Church | 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 |
| Cocaine Anonymous | Toronto Downtown Central |
| Cogir Senior Living, Appleby Place Retirement Home | Burlington |
| Cogir Senior Living, The Williamsburg Retirement Home | Burlington |
| Cogir Senior Living, Trafalgar Lodge Retirement Home | Oakville |
| College of Physicians and Surgeons of Ontario | Toronto Downtown Central |
| College of Registered Psychotherapists of Ontario | Toronto Downtown |
| 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 |
| Community Development Halton, Acton | Acton |
| Community Development Halton, Burlington | Burlington |
| Community Development Halton, Volunteer Halton | Burlington |
| Community Rehabilitation, In-Home Physiotherapy | Lorne Park |
| Community Service Movers, Mississauga | 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 |
| ConnexOntario, Helpline | London |
| Consent and Capacity Board | Toronto |
| 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 |
| Consolidated Credit Counselling Services of Canada | Toronto |
| Continental Austrian Club | Burlington |
| Coping Centre (The), Bereavement Support Services | Halton Region |
| Cornerstone Baptist Church | Oakville |
| Cornwall Medical Clinic | Oakville |
| Cornwall Pharmacy, Pharmacy Services | Oakville |
| Costco Pharmacy, Burlington - Brant St, Pharmacy Services | Burlington |
| Country Heritage Park, Food and Farm Education, Field Trip Venue, Private Tours, Heritage Venue, Event Venue and Operational Farm | Milton |
| 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 |
| Creative Community Hive, Burlington and Oakville, Community Crafting Sessions | Oakville |
| Credit Canada, Oakville Office | Oakville |
| Credit Canada Debt Solutions, Credit Canada Debt Solutions, Head Office / North York Office | 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 |
| Croatian Social and Cultural Centre | Halton Hills |
| Crohn's and Colitis Canada, Halton Region Chapter | Halton Region |
| Crossings Community Church | Acton |
| Crosstowne Church | Milton |
| Crusaders Rugby Club | Oakville |
| Cyber-Seniors | Ontario |
| Cycling Without Age Hamilton & Burlington | Burlington |
| Cystic Fibrosis Canada, Cystic Fibrosis Canada Hamilton Chapter Location, Cystic Fibrosis Canada Hamilton Chapter Services | Hamilton |
