| Camphill Communities Ontario, Barrie - Checkley St | Barrie |
| Canada Learning Code, Online/Web Service | |
| Canada Post Corporation, Barrie - Collier St, Post Office | Barrie |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Bradford West Gwillimbury |
| Canada. Border Services Agency, Mississauga | Mississauga |
| Canada. Canada Revenue Agency - Grey Bruce, Brockton, Community Volunteer Income Tax Program | Brockton |
| Canada. Canada Revenue Agency - Grey Bruce, Tobermory, Community Volunteer Income Tax Program | Northern Bruce Peninsula |
| Canada. Canada Revenue Agency [Barrie], Barrie, North Central Ontario Tax Services Office - Barrie | Barrie |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Innisfil |
| Canada. Canada Revenue Agency, Toronto Region, Toronto, Canada Child Benefit | Toronto |
| Canada. Canada Revenue Agency. Toronto North Tax Services Office, GST/HST Credit | North York |
| Canada. Canadian Food Inspection Agency, Barrie District Office, Canada. Canadian Food Inspection Agency, Barrie District Office | Barrie |
| Canada. Correctional Service Canada, Barrie Office, Parole Services | Barrie |
| Canada. Department of National Defence, Barrie Armoury, Grey and Simcoe Foresters | Barrie |
| Canada. Department of National Defence, Barrie, Canadian Forces Recruiting Centre | Barrie |
| Canada. Department of National Defence, Borden CFB - Cambrai Rd, Canadian Forces Base Borden | Adjala-Tosorontio |
| Canada. Department of National Defence, Borden CFB - Ortona Rd, Military Police | Adjala-Tosorontio |
| Canada. Health Canada, Ottawa - Mailing Address, First Nations and Inuit Hope for Wellness Helpline | 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. Members of Parliament, Holland Landing Office, York-Simcoe Federal Riding - Scot Davidson MP | East Gwillimbury |
| Canada. Members of Parliament [Central East], Simcoe-Grey Riding - Alliston Office, Federal Constituency Office - Simcoe-Grey Riding - Terry Dowdall MP | New Tecumseth |
| Canada. Members of Parliament [Central East], Simcoe-Grey Riding - Collingwood Office, Federal Constituency Office - Simcoe-Grey Riding - Terry Dowdall MP | Collingwood |
| Canada. Veterans Affairs Canada [Toronto area], Mississauga Service Centre | Mississauga |
| CanadaHelps | |
| Canadian Adaptive Snowsports (CADS) - Ontario - Huronia Region Programs | Simcoe |
| Canadian Anti-Fraud Centre, No physical location | North Bay |
| Canadian Cancer Society, Mailing Address, Cancer Information and Transportation Service | |
| Canadian Cancer Society - Ontario Division, Cancer Information Service | Toronto Downtown North |
| Canadian Celiac Association | Mississauga |
| Canadian Centre for Housing Rights, Eviction Prevention and Tenant Services | Toronto |
| Canadian Centre to End Human Trafficking, Canadian Human Trafficking Hotline | Toronto |
| Canadian Council on Rehabilitation and Work | Toronto |
| Canadian Designated Drivers, Barrie - Mailing Address | Barrie |
| Canadian Environmental Law Association, Toronto | Toronto |
| Canadian Firearms Program | Ottawa |
| Canadian Hearing Services | |
| Canadian Hearing Services, Communication Devices and Interpreting Services | |
| Canadian Hearing Services, Connect Mental Health Counselling | |
| Canadian Hearing Services, Hearing Care Counselling Program | |
| Canadian Hearing Services, Sound Advice Sessions | |
| Canadian Human Rights Commission | Ottawa |
| Canadian Mental Health Association, York Region and South Simcoe, CMHA Alliston | New Tecumseth |
| Canadian Mental Health Association. Simcoe County Branch, Barrie - 128 Anne St S, Case Management | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Community Awareness Program | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Volunteer Program | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Early Psychosis Intervention | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Barrie - 134 Anne St S, Housing Support | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Human Services Justice System Program | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, RSVP Clubhouse | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Crisis Bed Unit | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Barrie, Justice Safe Beds | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Regional Francophone Navigator | Midland |
| Canadian Mental Health Association. Simcoe County Branch, Crisis Outreach and Support Team (COAST) / Mobile Crisis Response Teams (MCRT) | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Online / Telephone Service, Family Caregiver Support Group | |
| Canadian Mental Health Association. Simcoe County Branch, Online / Telephone Service, System Navigation Support | |
| Canadian Mental Health Association. Simcoe County Branch, Mental Health Crisis Line | |
| Canadian Mental Health Association. Simcoe County Branch, Various Locations, Community Homes for Opportunity | |
| Canadian Musicians Co-operative | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Disaster Management | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Friendly Visiting and Telephone Assurance | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Meals on Wheels | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Prevention and Safety, First Aid, CPR, Water Safety, Psychological First Aid | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Transportation | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Volunteer Services | Barrie |
| Canadian Red Cross, Toronto Branch, First Contact Program | Toronto |
| Canadian Tire Jumpstart Charities, Mailing Address, Barrie & Simcoe County Chapter | Toronto |
| Car Heaven, London | London |
| CarePartners, Barrie | Barrie |
| Caring Hands Midwifery Services | New Tecumseth |
| CARP, Barrie - Mailing Address, Barrie CARP Chapter # 36 | Barrie |
| Catulpa Community Support Services, Alliston Office, Adult Protective Service Worker Program | New Tecumseth |
| Catulpa Community Support Services, Alliston Office, Family Resource Services | New Tecumseth |
| Catulpa Community Support Services, Barrie Office | Barrie |
| Catulpa Community Support Services, Barrie Office, Community Action Program for Children (CAPC) | Barrie |
| Catulpa Community Support Services, Barrie Office, Coordinated Service Planning | Barrie |
| Catulpa Community Support Services, Barrie Office, Crisis Response Coordination Program | Barrie |
| Catulpa Community Support Services, Barrie Office, FASD Key Services and Support Program | Barrie |
| Catulpa Community Support Services, Barrie Office, MotherCare Prenatal Program (Canada Prenatal Nutrition Program - CPNP) | Barrie |
| Catulpa Community Support Services, Barrie Office, Next Step Program | Barrie |
| Catulpa Community Support Services, Barrie Office, Ontario Autism Program - Family Service Coordination | Barrie |
| Catulpa Community Support Services, Barrie Office, WrapAround | Barrie |
| CBI Home Health | Barrie |
| Central X-Ray & Ultrasound, Bradford | Bradford West Gwillimbury |
| Centre for Behaviour Health Sciences, Barrie Office, Behaviour Clinic of York and Simcoe | Barrie |
| CFJB Rock 95 FM, Barrie | Barrie |
| CFS Counselling + Wellbeing, Barrie - Anne St S, Partner Assault Response | Barrie |
| CFS Counselling + Wellbeing, Barrie - Anne St S, Ready2Talk Counselling Clinic | Barrie |
| CFS Counselling + Wellbeing, Barrie - Anne St S, Spark'd Newcomer Counselling & Outreach Services | Barrie |
| CFS Counselling + Wellbeing, Barrie - Anne St S, Walk In Wednesdays | Barrie |
| CFS Counselling + Wellbeing, Barrie - Anne St S, Youth Programs | Barrie |
| CFS Counselling + Wellbeing, MatureMinds, Barrie - Anne St S | Barrie |
| CFS Counselling + Wellbeing, Orillia Satellite Office, Spark'd Newcomer Counselling & Outreach Services | Orillia |
| Chabad Jewish Centre, Barrie | Barrie |
| Chappell Farms | Barrie |
| CHATS - Community & Home Assistance to Seniors [Central East], Bradford West Gwillimbury, CHATS - Community & Home Assistance to Seniors [Central East], Bradford West Gwillimbury | Bradford West Gwillimbury |
| Child & Youth Advocacy Centre Simcoe Muskoka, Barrie | Barrie |
| Child & Youth Advocacy Centre Simcoe Muskoka, Orillia | Orillia |
| Child Youth and Family Services Coalition of Simcoe County | Barrie |
| Children's Treatment Network of Simcoe York | Barrie |
| Christian Island. Guiding Lights Seniors Centre | Beausoleil First Nation |
| Christmas for Kids | Innisfil |
| Church of the Evangelists (Anglican), Tottenham | New Tecumseth |
| Cineplex Theatres Barrie, Galaxy Cinemas Barrie, Stars and Strollers | Barrie |
| CJLF Life 100.3 FM | Barrie |
| Clarke's Farm | Springwater |
| CLEAResult Canada, Central East, Enbridge Home Winterproofing and IESO Energy Affordability Programs | Toronto |
| CLEAResult Canada, Central, Enbridge Home Winterproofing and IESO Energy Affordability Programs | Toronto |
| Clearview Ministerial Association, No Physical Address | Clearview (Simcoe County) |
| CLEO | Toronto |
| Closing the Gap Healthcare, Barrie | Barrie |
| CNIB Foundation [Central East] | Barrie |
| CNIB Foundation [Central East], Barrie, Vision Mate Program | Barrie |
| Coalition on the Niagara Escarpment | Hamilton |
| Colibri - Centre des femmes francophones du comté de Simcoe, Barrie | Barrie |
| Collège Boréal, Barrie | Barrie |
| Collège Boréal, Barrie, Immigration Programs and Services | Barrie |
| Collège Boréal, Barrie, Integrated Employment Services | Barrie |
| College of Dental Technologists of Ontario | Scarborough |
| College of Physicians and Surgeons of Ontario | Toronto Downtown Central |
| College of Psychologists of Ontario (The) | Toronto Downtown North |
| Collingwood and District Historical Society | Collingwood |
| Collingwood Farmers' Market, Collingwood | Collingwood |
| Collingwood General and Marine Hospital | Collingwood |
| Commissionaires, Barrie, Identification Services | Barrie |
| Community Builders | Springwater |
| Community Connection, Collingwood - Campbell St, 211 Central East Region Contact Centre | Collingwood |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Orillia Head Office | Orillia |
| Community Literacy of Ontario, Literacy and Basic Skills Support Organization | Midland |
| Community Living Association for South Simcoe, Alliston | New Tecumseth |
| Community Living Association for South Simcoe, Alliston, Community Participation Resource Centre | New Tecumseth |
| Community Living Association for South Simcoe, Alliston, Parent / Advocate Support Group | New Tecumseth |
| Community Living Association for South Simcoe, Residential and Community Services, Alliston | New Tecumseth |
| Community Reach, Transportation | Midland |
| Consolidated Credit Canada, Mailing Address | Toronto |
| CONTACT Community Services, Alliston - 39 Victoria St E | New Tecumseth |
| CONTACT Community Services, Alliston - 39 Victoria St E, Housing Resource Centre | New Tecumseth |
| CONTACT Community Services, Alliston - 55 Victoria St W, Clothes Line (The) Alliston | New Tecumseth |
| CONTACT Community Services, Alliston - 55 Victoria St W, Coats 4 Kids | New Tecumseth |
| CONTACT Community Services, Bradford - 95 Holland St W, Unit 1, Ontario Employment Services | Bradford West Gwillimbury |
| CONTACT Community Services, Bradford - 95 Holland St W, Unit 2, Clothes Line (The) Bradford | Bradford West Gwillimbury |
| CONTACT Community Services, Bradford - 95 Holland St W, Unit 2, Coats 4 Kids | Bradford West Gwillimbury |
| CONTACT Community Services, Exchange WORKS, Alliston - 39 Victoria St E | New Tecumseth |
| CONTACT Community Services, Volunteer South Simcoe, Alliston - 39 Victoria St E | New Tecumseth |
| COPE Service Dogs | Barrie |
| Copeland Creek Farm, Certified Organic Farm Fresh Products | Penetanguishene |
| Cover Health, Virtual Service, Virtual Walk-In Clinic | Brampton |
| Creative Kids Preschool of Alliston | New Tecumseth |
| Credit Canada Debt Solutions, Telephone Service | Toronto |
| Creedan Valley Community | Clearview (Simcoe County) |
| Crime Stoppers of Simcoe-Dufferin-Muskoka | Barrie |
| Crohn's and Colitis Canada, Mailing Address, Northern Ontario | Toronto |
| CT Link, Community Transportation | Barrie |
| CTV Barrie | Barrie |