| | Organization Name(s) | Located In |
 | Caledon Community Services | Bolton |
| Caledon Enterprise | Bolton |
| | Caledon Hills Bruce Trail Club | Caledon (Town of) |
| Calvary House (Markham) Corp | Markham |
| Calvary Korean Presbyterian Church | Markham |
| CAMH, Health Information Centre | Toronto |
| | Camp BUCKO, Burn Camp for Kids in Ontario | Toronto |
| Camp Quality Canada, The Puppet Program | Toronto |
| Camp Robin Hood | Markham |
| Camp Winston | Toronto |
| | Campaign Lake Simcoe | Toronto |
| | Canada, Canada Revenue Agency | Canada |
| Canada, Canadian Intellectual Property Office | Gatineau |
| Canada, Canadian International Development Agency | Gatineau |
| Canada, Citizenship and Immigration | North York |
| Canada, Environment Canada, Ontario Region | Toronto |
| Canada, Food Inspection Agency, Animal Health Program | Richmond Hill |
| Canada, National Defence, Aurora Armoury | Aurora |
| | Canada Business Ontario | Toronto |
| Canada Chinese Computer Association | Markham |
| | Canada Day, Markham Celebration - Sunday, July 1, 2012 | Markham |
| Canada Day Seniors Luncheon | Markham |
| Canada Mortgage and Housing Corporation | Toronto |
| Canada Mortgage and Housing Corporation, Home Adaptations for Seniors' Independence | Toronto |
| Canada Post Corporation, Aurora Convenience, Aurora Post Office North | Aurora |
| | Canada Post Corporation, Canada Post - Hotline | Toronto |
| Canada Post Corporation, Harding Postal Outlet | Richmond Hill |
| Canada Post Corporation, Hillcrest Postal Station | Richmond Hill |
| Canada Post Corporation, King City Postal Office | King City |
| | Canada Post Corporation, Markham Postal Outlets | Markham |
| Canada Post Corporation, Newmarket | Newmarket |
| Canada Post Corporation, Nobleton Postal Office | Nobleton |
| | Canada Post Corporation, Postal Code Information | Markham |
| Canada Post Corporation, Postal Outlet, Oxford and Yonge Street | Richmond Hill |
| Canada Post Corporation, Regency Variety, Aurora Shopping Centre Post Office | Aurora |
| Canada Post Corporation, Richmond Hill Post Office Postal Station B, Oak Ridges | Oak Ridges |
| Canada Post Corporation, Richmond Hill Postal Outlet | Richmond Hill |
| Canada Post Corporation, Schomberg Postal Office | Nobleton |
| | Canada Post Corporation, Whitchurch-Stouffville Postal Outlets | Whitchurch-Stouffville |
| Canada Revenue Agency, Personal Income Tax, GST, Seniors Cards, Child Tax Benefits | Toronto |
| Canada World Youth, Central Canada Regional Office | Toronto |
| Canada World Youth, Head Office | Montreal |
| Canada., Service Canada, Pleasure Craft Licensing | Ottawa |
| | Canada. Canada Customs and Revenue Agency, Charities Directorate | Ottawa |
| Canada. Canada Customs and Revenue Agency, Toronto Centre Tax Services Office | Toronto |
| Canada. Citizenship and Immigration | Scarborough |
| | Canada. Citizenship and Immigration, Canadian Citizenship Test Information | Markham |
| Canada. Citizenship and Immigration Canada | Scarborough |
| Canada. Citizenship and Immigration. Ontario Region, Permanent Resident Card | Toronto |
| Canada. Customs and Revenue Agency, Toronto North Tax Services Office | North York |
| Canada. Environment Canada, WeatherOffice | Canada |
| Canada. Foreign Affairs and International Trade, Passport Office, Scarborough | Scarborough |
| Canada. Foreign Affairs and International Trade,, Passport Office, North York | North York |
| | Canada. Government of Canada | Ottawa |
| Canada. Health and Welfare Canada, Income Security Programs Branch | Toronto |
| Canada. House of Commons, Member of Parliament, Lois Brown | Newmarket |
| Canada. Human Resources Development Canada, Income Security Programs | Scarborough |
| | Canada. Members of Parliament, Federal | Ottawa |
| Canada. Members of Parliament, John McCallum - MP, Markham-Unionville | Markham |
| Canada. Members of Parliament, Paul Calandra - MP, Oak Ridges-Markham | Stouffville |
| Canada. Members of Parliament, Peter Kent - MP, Thornhill | Thornhill |
| Canada. Public Health Agency of Canada, Pandemic Influenza Information Website | Canada |
| Canada. Revenue Agency, Toronto East Tax Services Office | Scarborough |
| Canada. Service Canada, Human Resources and Skills Development, Richmond Hill Human Resource Centre | Richmond Hill |
| Canada. Statistics Canada. Statistical Reference Centre | Toronto |
| | Canada's National Ballet School | Toronto |
| Canada's Wonderland | Vaughan |
| Canadian Action Party | Toronto |
| | Canadian Air & Space Museum | Toronto |
| Canadian Alliance for Development Initiatives and Projects (CADIP) | Vancouver |
| Canadian Alliance of British Pensioners | Toronto |
| | Canadian Amyloidosis Support Network, Inc | Markham |
| | Canadian Association of Credit Counselling Services | Richmond Hill |
| Canadian Association of Physicians for the Environment | Toronto |
| | Canadian Association of Retired Persons | Markham |
| Canadian Automobile Association, South Central Ontario, Markham Office | Thornhill |
| Canadian Bankers Association | Toronto |
| Canadian Bar Association - Ontario | Toronto |
| Canadian Blood Services Blood Donor Clinic, Hillcrest Mall (Entrance #3) | Richmond Hill |
| | Canadian Blood Services. Toronto | Toronto |
| Canadian Breast Cancer Foundation - Ontario Branch | Toronto |
| Canadian Broadcasting Corporation | Toronto |
| Canadian Cancer Society, Holland River Unit | Newmarket |
| Canadian Cancer Society, Hope and the City Committee | Markham |
| Canadian Cancer Society, Ontario Division | Toronto |
| Canadian Cancer Society, South York Region Unit | Richmond Hill |
| Canadian Cancer Society, South York Region Unit | Richmond Hill |
| Canadian Cat Association | Brampton |
| Canadian Celiac Association | Mississauga |
| Canadian Centre for Abuse Awareness Martin Kruze Memorial Fund | Newmarket |
| Canadian Centre for Occupational Health and Safety, CCOHS, Health and Safety Inquiries | Hamilton |
| | Canadian Centre for Pet Loss Bereavement | Canada |
| Canadian Childrens Theatre Company | Aurora |
| Canadian Citizenship Test Information | Toronto |
| Canadian Coin and Currency | Richmond Hill |
| Canadian College of Naturopathic Medicine | Toronto |
| Canadian Consumer Information Gateway | Ottawa |
| Canadian Crossroads International (CCI), National Office | Toronto |
| Canadian Cystic Fibrosis Foundation Toronto & District Chapter | Toronto |
| Canadian Diabetes Association, Clothesline | Newmarket |
| Canadian Diabetes Association Toronto Branch | Toronto |
| Canadian Environmental Law Association | Toronto |
| Canadian Federation of Independent Business | Toronto |
| Canadian Federation of University Women, Aurora-Newmarket | Aurora |
| | Canadian Federation of University Women, Markham/Unionville | Markham |
| Canadian Food Inspection Agency, Animal Health | Markham |
| Canadian Foundation for the Study of Infant Deaths | Toronto |
| Canadian Golden Retriever Adoption Service Inc. | Markham |
| Canadian Guide Dogs for the Blind | Ottawa (City of) |
| Canadian Hand Emulation Research Organization | Richmond Hill |
| Canadian Hearing Society, Sign Language Services | Newmarket |
| | Canadian Hearing Society Ontario Interpreting Services (OIS), Emergency Interpreter Service | Canada |
| | Canadian Human Rights Commission | Ottawa |
| Canadian Institute of Chartered Accountants | Toronto |
| Canadian Kennel Club | Toronto |
| Canadian Liver Foundation | Toronto |
| Canadian Mar Thoma Church | Markham |
| Canadian Marfan Association | Mississauga |
| Canadian Marketing Association (The) | Toronto |
| Canadian MedicAlert Foundation | Scarborough |
| Canadian Mental Health Association, Identification Clinic, Vaughan Branch | Vaughan |
| Canadian Mental Health Association, Vaughan Community Health Centre | Vaughan |
| Canadian Mental Health Association, York Region Branch | Aurora |
| Canadian Museum of Hindu Civilization Inc, CMOHC | Richmond Hill |
| | Canadian Neuropathy Association | Pefferlaw |
| | Canadian Orthopaedic Foundation - Ortho Connect | York Region |
| Canadian Paediatric Society, Caring for Kids | Ottawa |
| Canadian Paraplegic Association, Ontario Branch | Toronto |
| Canadian Parents for French (York Region) | Newmarket |
| Canadian Pensioners Concerned, Ontario Division | Toronto |
| Canadian Peregrine Foundation | Toronto |
| Canadian Power and Sail, Markham Power Squadron | Markham |
| | Canadian Progress Club | Brampton (City of) |
| Canadian Quaker Archives at Pickering College | Newmarket |
| Canadian Radio-Television and Telecommunications Commission (CRTC), Ontario Branch | Toronto |
| Canadian Real Estate Association | Ottawa |
| Canadian Red Cross Society, Region of York Branch | Richmond Hill |
| Canadian School of Natural Nutrition | Richmond Hill |
| | Canadian Society of Dowsers Spirit of Wellness (King Township) | King Township |
| Canadian Spinal Research Organization | Richmond Hill |
| | Canadian Tire JumpStart | Toronto |
| | Canadian Virtual Hospice | Winnipeg |
| Canadian Volunteer Fire Services Association | North York |
| | Canadian Wildlife Federation, The | Kanata |
| | Canadians Multicultural Links Association | Markham |
| Cancer Connection, Peer Support | Hamilton |
| Cangrands National Kinship Support, Children Raised By Grandparents | Addington Highlands |
| Cantabile Chorale of York Region | Thornhill |
| Car Heaven - Toronto | Toronto |
| | Cardinal Golf Club | Kettleby |
| | Care Guide (The) | Vaughan |
| Carefirst Seniors and Community Services Association, . | Richmond Hill |
| Carefirst Seniors and Community Services Association, Adult Daycare for Chinese Community | Richmond Hill |
| | Caregiving Matters | Aurora |
| Carfax, Vehicle History Reports | USA |
| Caritas Project for Addiction | Toronto |
| Carpenter's District Council of Ontario | Woodbridge |
| Carrickmacross Golf Centre | Maple |
| Carrying Place Golf and Country Club | Aurora |
| Casa Loma | Toronto |
| Casey House Hospice | Toronto |
| | Casting Off The Cold, Charity Knitting Group | Markham |
| | Cathedraltown Community Ratepayers Association | Markham |
| Catholic Community Services of York Region | Richmond Hill |
| Catholic Community Services of York Region, Markham North Branch, Markham North Welcome Centre | Markham |
| Catholic Cross Cultural Services | Toronto |
| | Cathy's Crawly Composters | Bradford |
| | Cause Initiatives for Youth and Community | Richmond Hill |
| | CDR Footcare | Maple |
| Cedar Beach Park | Stouffville |
| Cedar Crest Manor | Markham |
| Cedar Grove Community Centre | Markham |
| Cedar Grove Community Club | Markham |
| | Cedar Grove Community Park | Markham |
| Cedarena | Markham |
| Cedarview Community Church | Newmarket |
| Cedarwood Community Association | Markham |
| | Cedarwood Tamil Community Association | Markham |
| Cemeteries - Markham | Markham |
| Centenary Health Centre, Rouge Valley | Scarborough |
| | Centennial College of Applied Arts and Sciences | Scarborough |
| Centered on Children Child Care Centre | Woodbridge |
| Centerpoint Shopping Mall | Toronto |
| Central Community Care Access Centre, Newmarket Office | Newmarket |
| Central Community Care Access Centre, Richmond Hill Office | Richmond Hill |
| Central Local Health Integration Network, LHIN | Markham |
| Central United Church | Unionville |
| Central York Fire Services | Newmarket |
| Central York Fire Services, Aurora Fire Hall 4-3 | Aurora |
| Central York Fire Services, Fred Bolsby Fire Hall | Aurora |
| Central York Girls Hockey Association, Aurora Panthers Rep Hockey | Aurora |
| Centre for Dreams (The) | Markham |
| Centre for Addiction and Mental Health | Toronto |
| Centre for Addiction and Mental Health | Toronto |
| Centre for Addiction and Mental Health | Toronto |
| | Centre for Autism Remediation and Education Limited | Toronto (City of) |
| Centre for Equality Rights In Accommodation | Toronto |
| Centre for Information and Community Services | York Region |
| Centre for Information and Community Services, Chinese Community | Scarborough |
| Centre for Information and Community Services, CICS Chinese Community, Markham Community Service Centre | Markham |
| Centre for Information and Community Services, York Region Family and Education Centre | Markham |
| Centre for the Ways | Richmond Hill |
| Centre Green Co-operative Housing | Richmond Hill |
| | Centreville Amusement Park | Toronto |
| Century Montessori School | Richmond Hill |
| Chabad At Flamingo | Thornhill |
| Chabad Lubavitch Community Centre | Thornhill |
| Chabad Lubavitch of Aurora | Richmond Hill |
| Chabad Romano Centre | Maple |
| Cham Shan Temple | Thornhill |
| Chamber of Commerce, Whitchurch/Stouffville | Stouffville |
| Chapel Place Presbyterian Church | Markham |
| Chapel Ridge, Funeral Home | Markham |
| | Charity Law | |
| | Charity Law | Canada |
| CHATS - Community & Home Assistance to Seniors | Aurora |
| CHATS - Community & Home Assistance to Seniors, Ethnic Seniors Group | Aurora |
| CHATS - Community & Home Assistance to Seniors, Meals on Wheels | Aurora |
| CHATS - Community & Home Assistance to Seniors, Newcomer / South Asian Adult Day Program | York Region |
| Child & Family Canada | Canada |
| Child Evangelism Fellowship of Ontario | Markham |
| Childhood Cancer Canada Foundation | Toronto |
| Children's Aid Society, York Region, Incorporated as Children and Family Services for York Region | Newmarket |
| Children's Development Group | Richmond Hill |
| Childrens Montessori Academy | Richmond Hill |
| Children's Treatment Network of Simcoe York | Richmond Hill |
| Chinese Canadian National Council, York Region Chapter | Markham |
| Chinese Chamber of Commerce In Markham | Markham |
| Chinese Family Services of Ontario | Richmond Hill |
| Chinese Martyrs Catholic Church | Markham |
| Chippewas of Georgina Island First Nations | Georgina Island |
| | Choices in Health | Toronto |
| | Chris Stoikos Memorial Foundation | York Region |
| Christ Church Woodbridge | Woodbridge |
| Christ Evangelical Lutheran Church | Aurora |
| Christ the King Catholic Cemetery | Markham |
| Christ the King Graceland Independent Anglican Church | Aurora |
| Christ the King-Dietrich Bonhoeffer Lutheran Church | Thornhill |
| christian blind mission Canada, cbm Canada | Stouffville |
| Christian Children's Fund of Canada, CCFC | Markham |
| Christian Horizons | Toronto |
| Christian Horizons, Horizon House York 6 | Schomberg |
| Church of the Good Shepherd (The) | Thornhill |
| Church Street Montessori | Aurora |
| Churchill Baptist Church, Churchill Community Church | Stouffville |
| CICS Immigrant Youth Centre | Markham |
| CIMS Drug Mart | Richmond Hill |
| CIMS Home Health Care | Richmond Hill |
| Circle of Care | Toronto |
| Citizens for Affordable Housing - York Region | Richmond Hill |
| City of David Messianic Synagogue | Thornhill |
| | City Youth Players | Thornhill |
| | Clairville Ranch | Brampton |
| Clean Air Foundation, Car Heaven | Ontario |
| Clean Air Partnership | Toronto |
| Cleaning For A Reason Foundation | Richmond Hill |
| | Cleaning For A Reason Foundation, Cancer Patients Housework | Markham |
| | Cleaning For A Reason Foundation - Aurora | York Region |
| Climbers Edge | Milliken |
| Clock Tower Inn and Retirement Residence | Newmarket |
| | Clock Tower Theatre Association (The) | Stouffville |
| Club Unity | Richmond Hill |
| CMC Medical Centre, CMC Dental Centre | Markham |
| CNIB | Newmarket |
| Coaching Association of Canada | Ottawa |
| Cobblestone Lodge Retirement Home | Aurora |
| | Cold Creek Conservation Area | King Township |
| College of Chiropodists of Ontario, (Includes Podiatrists) | Toronto |
| College of Dental Hygenists of Ontario | Toronto |
| College of Dental Technologists of Ontario | Scarborough |
| College of Denturists of Ontario | Toronto |
| College of Dietitians of Ontario | Toronto |
| College of Massage Therapists of Ontario | Toronto |
| College of Medical Radiation Technologists of Ontario | Toronto |
| College of Nurses of Ontario | Toronto |
| College of Optometrists of Ontario | Toronto |
| College of Physicians and Surgeons of Ontario | Toronto |
| College of Physiotherapists of Ontario | Toronto |
| College of Psychologists of Ontario | Toronto |
| College of Respiratory Therapists of Ontario | Toronto |
| Collision Reporting Centres | Richmond Hill |
| | Comcare Health Services | North York |
| Comfort Keepers | Newmarket |
| Comfort Keepers, Home Care, Patient Care, Nursing Services | York Region |
| Community Information Hamilton | Hamilton |
| Community Alliance for York Region Education | Aurora |
| Community Association for Riding for the Disabled | North York |
| Community Bible Church | Aurora |
| Community Care Access Centre | Richmond Hill |
| Community Christian Reformed Church of Richmond Hill | Richmond Hill |
| Community Church of Richmond Hill | Richmond Hill |
| Community Credit Counselling Services, Family Services, Community Service Order Program, Youth Referral Program | Thornhill |
| Community Hebrew Academy of Toronto, Richmond Hill Campus | Vaughan |
| Community Information and Volunteer Centre - York Region | Aurora |
| Community Legal Aid Clinic York Region, Legal Aid Ontario | Richmond Hill |
| Community Legal Education Ontario (CLEO) | Toronto |
| Community Living Newmarket/Aurora District | Newmarket |
| Community Living York South | Richmond Hill |
| Community Living York South, Community Support Program, Vaughan Branch | Vaughan |
| Community Living York South, Community Support Program, Markham | Markham |
| Community Mennonite Church of Stouffville | Stouffville |
| Community Safety Village of York Region, CSVYR | Stouffville |
| Compassionate Advantage Inc, York Region, Richmond Hill | York Region |
| Competition Bureau Canada | Gatineau |
| | Concerned Citizens of King Township | King Township |
| Concerned Friends of Ontario Citizens In Care Facilities | Toronto |
| Concerts In the Park | Richmond Hill |
| | Concord West Ratepayers Association | Concord |
| Congress of Black Women of Canada (The), York Region Chapter | Richmond Hill |
| | ConnexOntario Health Services Information, Drug and Alcohol Registry of Treatment | |
| | ConnexOntario Health Services Information, Mental Health Service Information Ontario | |
| | ConnexOntario Health Services Information, Ontario Program Gambling Helpline | |
| Conseil Scolaire de District Catholique Centre Sud, École Élémentaire Catholique Sainte-Marguerite-Bourgeoys | Markham |
| Conseil Scolaire de District Catholique Centre Sud, Ecole Elementaire Catholique Saint-Jean | Aurora |
| Conseil Scolaire de District Catholique Centre Sud, Ecole Secondaire Catholique Renaissance | Aurora |
| | Conservation Ontario | Newmarket |
| Conservative Party of Canada | Ottawa |
| Constantia Retirement Residence | Thornhill |
| Cooks Bee Supplies | Aurora |
| Copper County Foods | Brampton |
| Cornell Community Centre, Older Adult Centre | Markham |
| Cornell Medical Centre | Markham |
| | Cornell Ratepayers Association | Markham |
| Cornerstone Christian Community Church | Markham |
| Corporatemarkham.com Inc | Markham |
| Correctional Service Canada, Toronto East Parole Office | Scarborough |
| Cosmos Music Company | Richmond Hill |
| COSTI, Enhanced Language and Training Services, Richmond Hill | Richmond Hill |
| COSTI - Employment Services, Concord Centre | Concord |
| Costi - Iias Immigrant Services, Job Search for Newcomers (website) | Toronto |
| COSTI Enhanced Language Training for Accountants | Vaughan |
| COSTI Immigrant Services, Community Connections Program | North York |
| Costi Immigrant Services, Employment Services, Vaughan | Vaughan |
| COTA Health | Toronto |
| Country Day School (The) | King City |
| Country Home Care Services Limited | Stouffville |
| | Country Images Camera Club | Newmarket |
| Country Shul Synagogue | Richmond Hill |
| Covenant House | Toronto |
| Creative Children's Montessori School | Maple |
| Cricklewood Ratepayers Association | Thornhill |
| | Crime Stoppers - York Region | York Region |
| Crohns and Colitis Foundation of Canada, Richmond Hill/Vaughan Affiliate, Markham /Stouffville Affiliate | Toronto |
| Crohn's and Colitis Foundation of Canada | Toronto |
| Crosslinks Housing and Support Services, Loft Community Services | Aurora |
| Crown Heights Co-op Homes Inc | Thornhill |
| Crystal Fountain Banquet Hall | Markham |
| CTV Television Network Ltd | Toronto |
| Cultural Interpretation Services for our Communities | Ottawa |
| Cummer Lodge Home for the Aged | Toronto |
| Curtain Club | Richmond Hill |
| CUSO | Ottawa |
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