| Cabbagetown Women's Clinic | Toronto Downtown East |
| Caithkin Treatment Foster Homes | Wasaga Beach |
| Calvary Community Church, Shanty Bay | Oro-Medonte |
| Camp Kirk | Kawartha Lakes |
| Camp Promise Barrie, Mailing Address | Barrie |
| Camp Trillium Childhood Cancer Support Centre | Hamilton |
| Camphill Communities Ontario, Barrie - Checkley St | Barrie |
| Camping in Ontario / OPCA | Whitby |
| Canada Homestay Network | Barrie |
| Canada House, Barrie | Barrie |
| Canada Learning Code, Online/Web Service | |
| Canada Mortgage and Housing Corporation, Ontario | Toronto |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Bradford West Gwillimbury |
| Canada. Border Services Agency, Mississauga | Mississauga |
| Canada. Canada Revenue Agency [Barrie], Barrie - South End, Community Volunteer Income Tax Program | Barrie |
| Canada. Canada Revenue Agency [Barrie], Barrie, North Central Ontario Tax Services Office - Barrie | Barrie |
| Canada. Canada Revenue Agency [Barrie], No Physical Address, Community Volunteer Income Tax Program | Barrie |
| Canada. Canada Revenue Agency [Central East], Online/Web Service, Online Course and Video Presentations | Barrie |
| Canada. Canada Revenue Agency [Simcoe County], Collingwood - Hume Street, Community Volunteer Income Tax Program | Collingwood |
| Canada. Canada Revenue Agency [Simcoe County], Collingwood - Saint Marie St, Community Volunteer Income Tax Program | Collingwood |
| Canada. Canada Revenue Agency [Simcoe County], Midland, Community Volunteer Income Tax Program | Midland |
| Canada. Canada Revenue Agency [Simcoe County], Orillia - Coldwater Rd W, Community Volunteer Income Tax Program | Orillia |
| Canada. Canada Revenue Agency [Simcoe County], Orillia, Community Volunteer Income Tax Program | Orillia |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Wasaga Beach |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Springwater |
| Canada. Canada Revenue Agency [Simcoe County], Community Volunteer Income Tax Program | Innisfil |
| Canada. Canada Revenue Agency, Toronto Region | Toronto |
| Canada. Canada Revenue Agency, Toronto Region, Canada Child Benefit | Toronto |
| 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. Indigenous Services Canada, Indian Residential Schools Resolution Health Support Program (IRSRHSP) | 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, Orillia, Simcoe North Federal Riding - Adam Chambers | Orillia |
| Canada. Members of Parliament [Central East] | |
| Canada. Members of Parliament [Central East], Barrie-Innisfil Riding, Federal Constituency Office - Barrie-Innisfil Riding - John Brassard MP | Barrie |
| Canada. Members of Parliament [Central East], Barrie-Springwater-Oro Medonte Riding, Federal Constituency Office - Barrie-Springwater-Oro Medonte Riding - Doug Shipley MP | Barrie |
| 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. Transport Canada, Sarnia, Office of Boating Safety - Pleasure Craft Licences | Sarnia |
| Canada. Transport Canada, Sarnia, Office of Boating Safety - Pleasure Craft Operator Card | Sarnia |
| Canada. Veterans Affairs Canada - Toronto, Mississauga Service Centre | Mississauga |
| CanadaHelps | |
| Canadian Adaptive Snowsports (CADS) - Ontario - Huronia Region Programs | Simcoe |
| Canadian Alopecia Areata Foundation | King Township |
| Canadian Angelman Syndrome Foundation, Canadian Angelman Syndrome Society | Edmonton |
| Canadian Authors Association, Aurora | Aurora |
| Canadian Bar Association (The), Pro Bono Initiative - Crisis in Ukraine | Ottawa |
| Canadian Blood Services, Barrie, Blood Donation Centre | Barrie |
| Canadian Blood Services, Orillia - No Physical Address, Blood Donor Services | Orillia |
| 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 | Ontario |
| Canadian Council of the Blind, Club 60 | Barrie |
| Canadian Council on Rehabilitation and Work | Toronto |
| Canadian Designated Drivers, Barrie - Mailing Address | Barrie |
| Canadian Environmental Law Association | Toronto |
| 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 Hearing Services - Toronto and York Region | Toronto |
| 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, Addiction Services | Barrie |
| 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, Barrie - 128 Anne St S, Urban Pantry Program - Barrie Good Food Box | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Barrie - 128 Anne St S, Urban Pantry Program - Cooking UP Workshops | 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, Barrie - 21 Bradford St, Assertive Community Treatment Team | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Human Services Justice System Program | 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, Collingwood - 186 Erie St - Suite 101, Addiction Services | Collingwood |
| Canadian Mental Health Association. Simcoe County Branch, Collingwood - 186 Erie St - Suite 101, Assertive Community Treatment Team | Collingwood |
| Canadian Mental Health Association. Simcoe County Branch, Midland, Addiction Services | Midland |
| 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, Mobile Crisis Services | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Online / Telephone Service, Family Caregiver Support Group | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Orillia - 50 Nottawasaga St, Addiction Services | Orillia |
| Canadian Mental Health Association. Simcoe County Branch, Orillia - 76 Nottawasaga St, Assertive Community Treatment Team | Orillia |
| Canadian Mental Health Association. Simcoe County Branch, System Navigation Support, Online / Telephone Service | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Mental Health Crisis Line | Barrie |
| Canadian Mental Health Association. Simcoe County Branch, Various Locations, Community Homes for Opportunity | Barrie |
| Canadian Musicians Co-operative | Barrie |
| Canadian Musicians Co-operative, Barrie Head Office | Barrie |
| Canadian Musicians Co-operative, Barrie Head Office, No More Starving Artists | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch | Barrie |
| Canadian Red Cross - Simcoe Muskoka, Simcoe Muskoka Branch, Emergency 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 Snowbird Association | Toronto |
| Canadian Tire Jumpstart Charities, Mailing Address, Barrie & Simcoe County Chapter | Toronto |
| Canadian Veterans Museum Association | Blue Mountains |
| Cancer Care Ontario, Ontario Breast Screening Program | Toronto |
| Candlelighters Simcoe - Parents of Children with Cancer, Barrie - Mailing Address | Barrie |
| Cangrands National Kinship Support, Mailing Address | Saskatchewan |
| Career Centre, Barrie, Integrated Employment Services | Barrie |
| CarePartners, Barrie | Barrie |
| Caring Hands Midwifery Services | New Tecumseth |
| CARP, Barrie - Mailing Address, Barrie CARP Chapter | Barrie |
| Catholic Women's League of Canada, St Mary's Church - Victoria Harbour | Victoria Harbour |
| Catholic Women's League of Canada, St Margaret's Parish - Midland | Midland |
| 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, Adult Protective Service Worker Program | Barrie |
| Catulpa Community Support Services, Barrie Office, Baby Steps | Barrie |
| 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 |
| Catulpa Community Support Services, Collingwood Office, Adult Protective Service Worker Program | Collingwood |
| Catulpa Community Support Services, Collingwood Office, Family Resource Services | Collingwood |
| Catulpa Community Support Services, Midland - Aberdeen Blvd, Adult Protective Service Worker Program | Midland |
| Catulpa Community Support Services, Midland - Aberdeen Blvd, Family Resource Services | Midland |
| Catulpa Community Support Services, Orillia Common Roof, Adult Protective Service Worker Program | Orillia |
| Catulpa Community Support Services, Orillia Common Roof, Family Resource Services | Orillia |
| CBI Home Health | Barrie |
| Centennial United Church, Stayner | Stayner |
| Central East Stroke Network, Barrie | Barrie |
| Central Ontario Humanists, Barrie - No Physical Address | Barrie |
| Central Ontario Psychology | Barrie |
| Central Taxi - Midland, Central Taxi, Conventional & Accessible Wheelchair Van | Midland |
| Central X-Ray & Ultrasound, Bradford | Bradford West Gwillimbury |
| Centre de santé communautaire CHIGAMIK Community Health Centre, Midland - Bayshore Dr, Biidaaban Doula Collective | Midland |
| Centre de santé communautaire CHIGAMIK Community Health Centre, Midland - Bayshore Dr | Midland |
| Centre de santé communautaire CHIGAMIK Community Health Centre, Midland - Bayshore Dr, Mama Tribe | Midland |
| Centre de santé communautaire CHIGAMIK Community Health Centre, Midland - Bayshore Dr, Quit Cafe - Nicotine Replacement Program | Midland |
| Centre de santé communautaire CHIGAMIK Community Health Centre, Midland - Bayshore Dr, Traditional Healing | Midland |
| Centre for Addiction and Mental Health | Toronto |
| 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, MatureMinds | 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, Midland Satellite Office, Ready2Talk Counselling Clinic | Midland |
| CFS Counselling + Wellbeing, Online/Web Service, Ready2Talk Counselling Clinic | Barrie |
| CFS Counselling + Wellbeing, Orillia Satellite Office, Ready2Talk Counselling Clinic | Orillia |
| CFS Counselling + Wellbeing, Orillia Satellite Office, Spark'd Newcomer Counselling & Outreach Services | Orillia |
| Chabad Jewish Centre, Barrie | Barrie |
| Champlain Manor Retirement Residence | Orillia |
| Charmed Again | Wasaga Beach |
| Chartwell, Chartwell Balmoral Retirement Residence | Collingwood |
| Chartwell Allandale Station Retirement Residence | Barrie |
| Chartwell Whispering Pines Retirement Residence | 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 Mental Health Ontario | Toronto |
| Children's Treatment Network of Simcoe York | Barrie |
| Chinese and Southeast Asian Legal Clinic, Toronto | Toronto |
| Chippewas of Rama First Nation, 5884 Rama Rd | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation, No physical address, Rest Stations for Extreme Weather Relief | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation, Williams Side Rd, Rama Fire and Rescue | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation - Wewana Minoodoodawin Health and Social Services, 6036 Rama Rd, Health and Social Services | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation - Wewana Minoodoodawin Health and Social Services, 6148 Rama Rd, Responsible Gaming Program | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation - Wewana Minoodoodawin Health and Social Services, Rama - 5901 Rama Rd, Rama Food Distribution Program | Chippewas of Rama First Nation |
| Chippewas of Rama First Nation Child Care, Rama - Grandmother Rd, Rama Early Childhood Services | Chippewas of Rama First Nation |
| Christian Heritage Party. Simcoe-Grey Federal Riding | New Tecumseth |
| Christian Island. Guiding Lights Seniors Centre | Beausoleil First Nation |
| Christian Sports | Oro-Medonte |
| Christmas Angels Help Group, The, No Physical Address | Southgate |
| Church of the Evangelists (Anglican), Tottenham | New Tecumseth |
| CIQB-FM/BIG 101, CIQB-FM/BIG101-FM, CIQB-FM/B101-FM | Midhurst |
| CKUN 101.3 (NISH Radio 101.3) FM. Christian Island Radio Station, CKUN 101.3 (NISH 101.3) FM. Christian Island Radio Station | Christian Island |
| Clear My Clutter | Collingwood |
| CLEAResult Canada, Central East, Enbridge Home Winterproofing and IESO Energy Affordability Programs | Toronto |
| Clearview Behavioural Solutions | Barrie |
| Clearview Behavioural Solutions, Teen Connect | Barrie |
| Clearview Community Church, Wasaga Beach, Clothing Depot, The | Wasaga Beach |
| Clearview Public Library, Creemore Branch | Creemore |
| Clearview Public Library, New Lowell Branch | New Lowell |
| Clearview Public Library, Stayner Branch | Clearview (Simcoe County) |
| Clearview Stayner Food Bank, Stayner | Clearview (Simcoe County) |
| Clearview Youth Centre | Clearview (Simcoe County) |
| Clearview. Municipal Office, Clearview Community Garden | Clearview (Simcoe County) |
| Clearview. Municipal Office, Clearview Public Transit | Clearview (Simcoe County) |
| Clearview. Municipal Office | Clearview (Simcoe County) |
| Clearview. Municipal Office, Various locations, Rest Stations for Extreme Weather Relief | Clearview (Simcoe County) |
| CLEO | Toronto |
| CLEO, Steps to Justice | Toronto |
| CLH Developmental Support Services, Community Participation Supports, Midland - Olive St | Midland |
| CLH Developmental Support Services, Midland - Aberdeen Blvd, Simcoe County Resource Consultation Services | Midland |
| CLH Developmental Support Services, Midland - King St, Supported Independent Living Program | Midland |
| CLH Developmental Support Services, Midland - Olive St | Midland |
| CLH Developmental Support Services, Supported Employment Program, Midland - King St | Midland |
| CLH Developmental Support Services, Supported Living Homes, Midland - Olive St | Midland |
| CLH Developmental Support Services, Transitional Aged Youth, Midland - Olive St | Midland |
| Closing the Gap Healthcare, Barrie | Barrie |
| CN Pensioners Association, Barrie Council | Barrie |
| CNIB Foundation [Central East] | Barrie |
| CNIB Foundation [Central East], Barrie, Nanji Family Foundation Smartlife Centre and Community Hub | Barrie |
| CNIB Foundation [Central East], Barrie, Vision Mate Program | Barrie |
| CNIB Simcoe / Muskoka, Midland, Penetanguishene, Orillia, and Barrie, Beyond Vision Loss Group | Barrie |
| Coalition on the Niagara Escarpment | Hamilton |
| Cocaine Anonymous, Barrie - No Physical Address, Southern Ontario Cocaine Anonymous - Barrie Meetings | Barrie |
| Coldwater Food Bank | Severn |
| Coldwater Museum | Severn |
| Coldwater United Church | Severn |
| Coleman Care Centre, Barrie | Barrie |
| 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, Literacy and Basic Skills | Barrie |
| Collège Boréal, Barrie, Ontario Employment Services | Barrie |
| College of Audiologists and Speech Language Pathologists of Ontario | Toronto Downtown North |
| College of Early Childhood Educators | Toronto |
| College of Psychologists of Ontario (The) | Toronto Downtown North |
| College of Registered Psychotherapists of Ontario | Toronto Downtown |
| Collier Place | Barrie |
| Collier Street United Church | Barrie |
| Collingwood After Hours Medical Clinic | Collingwood |
| Collingwood and District Historical Society | Collingwood |
| Collingwood Downtown Business Improvement Area | Collingwood |
| Collingwood Fire Department | Collingwood |
| Collingwood General and Marine Hospital | Collingwood |
| Collingwood General and Marine Hospital, Outpatient Mental Health Services | Collingwood |
| Collingwood General and Marine Hospital, Volunteer Services | Collingwood |
| Collingwood General and Marine Hospital, Collingwood OPP Detachment, Mobile Crisis Response Team | Collingwood |
| Collingwood General and Marine Hospital, Collingwood, Collingwood Well Baby Clinic | Collingwood |
| Collingwood General and Marine Hospital, Emergency Department | Collingwood |
| Collingwood General and Marine Hospital, Wasaga Beach Satellite Office, Outpatient Mental Health Services, Wasaga Beach Satellite Office | Wasaga Beach |
| Collingwood Leisure Time Club | Collingwood |
| Collingwood Public Library | Collingwood |
| Collingwood Public Library, Community Food Pantry | Collingwood |
| Collingwood Public Library, Computer Literacy Services | Collingwood |
| Collingwood Public Library, Exhibition Spaces | Collingwood |
| Collingwood Youth Centre | Collingwood |
| Collingwood. Municipal Office, Collingwood - Hurontario St | Collingwood |
| Collingwood. Municipal Office, Collingwood - St Paul St, Parks Recreaction and Culture - Collingwood Museum | Collingwood |
| Collingwood. Municipal Office, Collingwood - Stewart Rd, Collingwood Public Utilities - Water Department | Collingwood |
| Collingwood. Municipal Office, Colltrans terminal, Public Transit | Collingwood |
| Collingwood. Municipal Office, No physical address, Parks, Recreation and Culture - Fee Subsidy Program | Collingwood |
| Collingwood. Municipal Office, No physical address, Rest Stations for Extreme Weather Relief | Collingwood |
| Comfie Cat Shelter | Orillia |
| Comfort Keepers, Georgian Triangle | Collingwood |
| Comfort Keepers, Orangeville | Orangeville |
| Comfort Keepers Barrie | Barrie |
| Comfort Stitchers | Barrie |
| Comfy Care Haven | Barrie |
| Commissionaires, Barrie, Identification Services | Barrie |
| Common Point | Collingwood |
| Community Builders | Springwater |
| Community Connection, Collingwood - Campbell St (Collingwood Common Roof), 211 Central East Region Contact Centre | Collingwood |
| Community Connection, Collingwood - Campbell St (Collingwood Common Roof), Volunteer Centre of South Georgian Bay | Collingwood |
| Community Connection, Free and Low Cost Meals, Central East Ontario | Ontario |
| Community Foundation of Orillia and Area (The) | Orillia |
| Community Futures South Georgian Bay | Collingwood |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Barrie Satellite Office | Barrie |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Christian Island Satellite Office | Beausoleil First Nation |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Collingwood Satellite Office | Collingwood |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Haliburton Satellite Office | Haliburton |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Midland Office | |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Orillia Head Office, Aboriginal Justice Outreach Program | Orillia |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Orillia Head Office | Orillia |
| Community Legal Clinic-Simcoe Haliburton Kawartha Lakes, Orillia Head Office, Employment Law Services | 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 |
| Community Veterinary Outreach, Barrie | Barrie |
| Compassion Place Pregnancy & Family Care Centre, Midland, Compassion Place Pregnancy & Family Care | Midland |
| Compassionate Care Without Barriers, Barrie | Barrie |
| Conseil scolaire Viamonde | Toronto |
| Consent and Capacity Board | Toronto |
| Conservative Party of Canada, Barrie-Innisfil Federal Electoral District Association | Barrie |
| Conservative Party of Canada, Barrie-Springwater-Oro-Medonte Federal Electoral District Association | Barrie |
| Conservative Party of Canada. Simcoe-Grey Federal Riding Association, No physical location | Collingwood |
| Consolidated Credit Canada, Mailing Address, Credit Counselling and Debt Consolidation | 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 - 39 Victoria St E, Volunteer South Simcoe | 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, Integrated 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 |
| COPE Service Dogs | Barrie |
| Coral Hills Housing | Barrie |
| Coral Nonprofit Homes | Barrie |
| Cornerstone to Recovery, Women's Residential Addictions Facility | Barrie |
| Coronation Masonic Hall Inc | Elmvale |
| Couchiching Conservancy (The) | Orillia |
| Couchiching Family Health Team, Orillia - Memorial Ave | Orillia |
| Couchiching Ontario Health Team | Orillia |
| County Chordsmen, Barrie Barbershop Harmony Society | Barrie |
| Covenant Christian Reformed Church | Barrie |
| Cover Health, Virtual Service, Virtual Walk-In Clinic | Brampton |
| Creative Kids Preschool of Alliston | New Tecumseth |
| Credit Canada Debt Solutions, Telephone Service | Toronto |
| Creemore Community Christmas Dinner, Creemore Legion | Clearview (Simcoe County) |
| Crime Stoppers of Simcoe-Dufferin-Muskoka | Barrie |
| Crohn's and Colitis Canada, Mailing Address, Northern Ontario | Toronto |
| Crosspoint Business Ministry Connections | Barrie |
| CT Link, Community Transportation | Barrie |
| CTS Canadian Career College, Barrie Campus | Barrie |
| Cystic Fibrosis Canada | Toronto Downtown North |