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 | Carpenter's District Council of Ontario | Woodbridge |
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 | Cadence Health and Wellness | Newmarket |
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| call2recycle | Newmarket |
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 | Camp Concord, Mansfield Outdoor Centre | Bancroft |
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 | Camp Katonim | Georgina |
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| Camp Robin Hood | Markham |
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 | Canada Border Services Agency, Customs Division | Ontario |
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| Canada Chinese Computer Association, Mailing Address | Markham |
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 | Canada Mortgage and Housing Corporation, Ontario Business Centre | North York Central |
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 | Canada. Canada Pension Plan | Ontario |
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 | Canada. Canada Post Corporation [York Region], Newmarket Post Office | Newmarket |
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 | Canada. Canada Post Corporation [York Region], Canada Post King Township Locations | King City |
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| Canada. Canada Post Corporation [York Region], Canada Post Markham Locations | Markham |
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| Canada. Canada Post Corporation [York Region], Canada Post Richmond Hill Locations | Richmond Hill |
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| Canada. Canada Post Corporation [York Region], Canada Post Vaughan Locations | Vaughan |
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 | Canada. Canada Post Corporation [York Region], Post Office Service East Gwillimbury Locations | Holland Landing |
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 | Canada. Canada Post Corporation [York Region], Post Office Service Georgina Locations | Keswick |
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 | Canada. Canada Post Corporation [York Region], Whitchurch-Stouffville Postal Outlets | Whitchurch-Stouffville |
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| Canada. Canada Revenue Agency | North York Central |
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| Canada. Canada Revenue Agency [York Region], Tax Preparation Assistance (TPA) program | York Region |
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| Canada. Employment and Social Development Canada, Job Bank | Ontario |
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| Canada. Employment Insurance | Ontario |
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 | Canada. Indigenous Services Canada, Ontario Regional Office | Toronto Downtown Central |
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 | Canada. Members of Parliament.[York Region], Newmarket-Aurora Federal Electoral District, Federal Services to Constituents | Newmarket |
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 | Canada. Members of Parliament.[York Region], Aurora-Oak Ridges-Richmond Hill Federal Electoral District, Federal Services to Constituents | Richmond Hill |
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 | Canada. Members of Parliament.[York Region], King-Vaughan Federal Electoral District, Federal Services to Constituents | Vaughan |
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 | Canada. Members of Parliament.[York Region], Markham Thornhill Federal Electoral District, Federal Services to Constituents | Markham |
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 | Canada. Members of Parliament.[York Region], Markham-Stouffville Federal Electoral District, Federal Services to Constituents | Whitchurch-Stouffville |
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 | Canada. Members of Parliament.[York Region], Markham-Unionville Federal Electoral District, Federal Services to Constituents | Markham |
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 | Canada. Members of Parliament.[York Region], Richmond Hill Federal Electoral District, Federal Services to Constituents | Richmond Hill |
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 | Canada. Members of Parliament.[York Region], Thornhill Federal Electoral District, Canadian Federal Services to Constituents | Thornhill East |
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 | Canada. Members of Parliament.[York Region], Vaughan-Woodbridge Federal Electoral District, Federal Services to Constituents | Woodbridge |
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 | Canada. Members of Parliament.[York Region], York Simcoe Federal Electoral District, Canadian Federal Services to Constituents | Holland Landing |
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| Canada. Old Age Security Programs | Ontario |
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 | Canada. Royal Canadian Mounted Police [York Region], Toronto North Detachment | Newmarket |
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 | Canada. Veterans Affairs Canada [Toronto area], Veterans Ombudsman | Ontario |
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| Canadian Adaptive Snowsports, Ski Hills in Ontario | York Region |
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| Canadian Alopecia Areata Foundation, Mailing Address | King City |
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| Canadian and African Business Women's Alliance | York Region |
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 | Canadian Association of Orthodontists, Smiles 4 Canada | Markham |
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 | Canadian Blood Services.[York Region], Mobile Service | Newmarket |
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 | Canadian Cancer Society York Region, Holland River Community Office | Newmarket |
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| Canadian Celiac Association | Mississauga |
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 | Canadian Centre for Refugee and Immigrant Health Care, Urban Dental Clinic | Scarborough North |
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 | Canadian Coalition for Seniors' Mental Health | Markham |
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 | Canadian College of Holistic Health | Richmond Hill |
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 | Canadian College of Naturopathic Medicine Integrative Cancer Centre | North York |
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 | Canadian Community Table Tennis Association | Markham |
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 | Canadian Crime Victims Foundation | Newmarket |
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 | Canadian Federation of University Women Aurora Newmarket, Aurora - Royal Canadian Legion | Aurora |
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| Canadian Golden Retriever Adoption Service, Mailing Address | Barrie |
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 | Canadian Hearing Society.[York Region] | Newmarket |
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 | Canadian Liver Foundation, National Office and GTA Chapter Markham | Markham |
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 | Canadian Mar Thoma Church Toronto | Whitchurch-Stouffville |
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| Canadian Mental Health Association, BounceBack | Ontario |
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 | Canadian Mental Health Association, York Region and South Simcoe, York Region and South Simcoe Branch, Mental health support, education and services | Newmarket |
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 | Canadian Mental Health Association, York Region and South Simcoe, Aurora Office, Employment Support Program | Aurora |
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 | Canadian Mental Health Association, York Region and South Simcoe, Aurora Office, Support for Depression | Aurora |
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 | Canadian Mental Health Association, York Region and South Simcoe, Markham Office | Markham |
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 | Canadian Mental Health Association, York Region and South Simcoe, Vaughan Office | Vaughan |
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| Canadian Orthopaedic Foundation, Telephone Service, Ortho Connect Peer Support Program | York Region |
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 | Canadian Rheumotology Association | Mississauga |
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 | Canadian Tai Chi Academy | Newmarket |
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 | Canadian Tire Jumpstart | Toronto Downtown North |
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 | Canadian Trigeminal Neuralgia Association, Chapter Meeting Thornhill | Newmarket |
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 | Canadian Ukrainian Immigrant Aid Society, Daisy Avenue Office | Etobicoke South |
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 | Canadian Ukrainian Immigrant Aid Society, North York Office | North York West |
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 | Canadian Union of Public Employees 905 | Newmarket |
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 | Canorient Toronto, Canorient Community Centre | Vaughan |
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 | Care and Share Thrift Shop | Whitchurch-Stouffville |
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 | Carefect Home Health Care, Vaughan Office | Vaughan |
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 | Carefirst Seniors and Community Services Association, Administrative Office/North Toronto Office | Scarborough North |
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 | Carefirst Seniors and Community Services Association | Richmond Hill |
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| Caregiving Matters, Online/Web Service | King Township |
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| Caring Concerts, Mobile Performance | York Region |
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 | Caritas School of Life, Caritas School of Life and My Second Home, My Second Home and Addictions Day Program | Vaughan |
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 | Carpenters Local 27 Housing Co-operative Incorporated | Newmarket |
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| Casting Off the Cold, Mailing Address | Markham |
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 | Catch The Fire Newmarket | Newmarket |
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 | Catholic Community Services of York Region | Richmond Hill |
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 | Catholic Community Services of York Region, St. Joseph Catholic School, Settlement and Education Partnership in York Region | Richmond Hill |
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 | CBI Home Health | Newmarket |
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 | cbm Canada, Whitchurch-Stouffville - Stouffville Road, Fundraising for International Missions | Whitchurch-Stouffville |
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 | Cedar Centre | Newmarket |
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 | Cedar Heights Residential Living, Head Office | Richmond Hill |
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 | Cedardale Church of the Nazarene | Pefferlaw |
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 | Cedarview Community Church, Bread of Life Food Baskets | Newmarket |
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 | Central Local Health Integration Network | Markham |
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 | Central Local Health Integration Network, North York Site | North York Central |
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 | Central United Church, Central United Church Unionville, Place of worship | Unionville |
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 | Central York Fire Service | Newmarket |
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 | Central York Girls Hockey Association | Aurora |
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 | Centre for ADHD Awareness Canada | Markham |
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 | Centre for Dreams, (The) | Markham |
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 | Centre for Education and Training.[York Region], CLARS Language Assessment Centre York Simcoe | Richmond Hill |
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 | Centre for Immigrant and Community Services, Immigrant Women Resource Centre | Markham |
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 | Centre for Immigrant and Community Services, Immigrant Youth Centre | Markham |
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 | Centre for Immigrant and Community Services, Toronto Integrated Service Centre | Scarborough North |
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| Centre for Inner Education and Meditation, Newmarket Centre | Newmarket |
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 | Children's Breakfast Club, Markham - Ashton Meadows Public School | Markham |
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 | Chabad Flamingo | Markham |
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 | Chabad Lubavitch of Newmarket | Newmarket |
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 | Chabad Lubavitch of Southern Ontario, Chabad Lubavitch Community Centre | Thornhill East |
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 | Chabad Romano Centre | Maple |
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 | Chabad-Lubavitch of Markham | Thornhill East |
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 | Challenge Sports Club, Judo Club Challenge | Vaughan |
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 | Chapel Place Presbyterian Church | Markham |
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| Character Community Foundation of York Region, Mailing Address | York Region |
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 | CharActors Theatre Troupe | Thornhill East |
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 | Chartered Professional Accountants of Ontario | Toronto Downtown Central |
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 | Chartwell Aurora | Aurora |
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 | Chartwell Barton Retirement Residence | Newmarket |
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 | Chartwell Constantia Retirement Residence | Thornhill West |
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 | Chartwell Park Place Retirement Residence | Aurora |
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 | Chartwell Pine Grove Retirement Community | Woodbridge |
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 | Chartwell Rouge Valley Retirement Residence | Markham |
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 | Chartwell Valley Vista | Vaughan |
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 | Chartwell Woodhaven Long Term Care | Markham |
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 | Chasdei Kaduri Jewish Food Bank | Vaughan |
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 | CHATS - Community & Home Assistance to Seniors [Central East], Bradford West Gwillimbury | Bradford West Gwillimbury |
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 | CHATS - Community and Home Assistance to Seniors, Aurora - Head office | Aurora |
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 | CHATS - Community and Home Assistance to Seniors, Adult Day Program-Bradford | Bradford |
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 | CHATS - Community and Home Assistance to Seniors, Assisted Living | York Region |
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 | CHATS - Community and Home Assistance to Seniors, CHATS Richmond Hill, South Asian Program Integrated Program for Seniors and Adults | Richmond Hill |
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 | CHATS - Community and Home Assistance to Seniors, Friuli Terrace Apartment, Day program | Woodbridge |
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 | CHATS - Community and Home Assistance to Seniors, Richmond Hill - Yonge, Integrated Day Program for Seniors and Adults | Richmond Hill |
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 | Cherish Integrated Services | Markham |
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 | Child Find Ontario | Toronto |
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 | Childbirth Education Services | Whitby |
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| Childgate, Mailing Address | Richmond Hill |
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 | Children's Mental Health Ontario | Toronto Downtown Central |
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 | Children's Miracle Network | Vaughan |
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 | Children's Treatment Network of Simcoe York, CTN Head Office - York Resource Centre | Richmond Hill |
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 | Chinese and Southeast Asian Legal Clinic | Toronto Downtown Central |
|
 | Chinese Family Services of Ontario, Aaniin Community Centre | Markham |
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 | Chinese Martyrs Catholic Church, Roman Catholic Church with Shuttle Service | Markham |
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 | Chippewas of Georgina Island, Virginia Beach Marina, Aazhaawe Ferry | Georgina |
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 | Chippewas of Georgina Island First Nation, Georgina Island First Nations Public Library, Literacy and Basic Skills | Georgina Island |
|
 | Chippewas of Georgina Island First Nation, Georgina Island First Nations Public Library | Georgina Island |
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 | Chorus York, Richmond Hill Presbyterian Church | Richmond Hill |
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 | Christ Church (Anglican), Christ Church Holland Landing, Place of Worship | Holland Landing |
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 | Christ Church Woodbridge | Woodbridge |
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 | Christ Evangelical Lutheran Church | Aurora |
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 | Christ the King | Newmarket |
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 | Christian Baptist Church | Newmarket |
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| Christian Heritage Party, Mailing Address | Sharon |
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 | Church of the Good Shepherd, (The) | Thornhill East |
|
| Church of the Nazarene, Place of worship | Newmarket |
|
 | Church On The GO | Newmarket |
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 | Circle of Care | North York Central |
|
 | Circle of Support, (A) | Markham |
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 | City of Vaughan Baseball Association, Maple Community Centre | Maple |
|
 | City of Vaughan Hockey Association | Vaughan |
|
 | City Playhouse Theatre | Vaughan |
|
 | Clarico Place of York Region | Vaughan |
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| Cleaning for a Reason Foundation | York Region |
|
 | CLEO | Toronto Downtown Central |
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 | Cocaine Anonymous | Toronto Downtown North |
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 | CoDependents Anonymous, Richmond Hill Living Life Support Group | Richmond Hill |
|
 | College of Traditional Chinese Medicine Practitioners and Acupuncturists of Ontario | Thornhill East |
|
| Comfort Keepers Newmarket | York Region |
|
 | Comfort Keepers Vaughan | Vaughan |
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 | Commons Coffee and Catering, Newmarket - Riverwalk Commons and Lions Community Centre, Workskills Cafe and Catering Program | Newmarket |
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| Communications Disabilities Across Canada | York Region |
|
 | Community Access Learning Centre | Vaughan |
|
 | Community and Legal Aid Services Programme | North York West |
|
 | Community Bread on Main, St John Chrysostom Church | Newmarket |
|
 | Community Church of Richmond Hill | Richmond Hill |
|
 | Community Head Injury Resource Services of Toronto (CHIRS) | North York Central |
|
 | Community Legal Clinic of York Region | Richmond Hill |
|
 | Community Living Central York | Newmarket |
|
 | Community Living Georgina | Georgina |
|
 | Community Living York South, Community Living York South - Richmond Hill | Richmond Hill |
|
 | Community Living York South, Community Living York South Markham | Markham |
|
 | Community Living York South, Community Living York South Thornhill | Vaughan |
|
 | Community Mennonite Church of Stouffville, Whitchurch-Stouffville - Parkview Village - Ninth Line | Whitchurch-Stouffville |
|
 | Community Oriented Health Advisory Network, Care Center Thornhill East | Thornhill East |
|
 | Community Safety Village of York Region, Bruce's Mill Conservation Area | Whitchurch-Stouffville |
|
 | Complete Respiratory Care, Complete Respiratory Care - Vaughan Locations | Vaughan |
|
| Concerned Citizens of King Township | King City |
|
| Congress of Black Women of Canada | Richmond Hill |
|
| ConnexOntario | London |
|
 | Conseil scolaire de district catholique Centre-Sud, École secondaire catholique Renaissance | Aurora |
|
 | Conservation Ontario | Newmarket |
|
 | Consolidated Credit Counseling Services of Canada | North York East |
|
 | CONTACT Community Services, Bradford, Bradford Works - Ontario Employment Services | Bradford |
|
 | Contact North, Georgina Online Learning Centre | Keswick |
|
 | Co-operative Housing Federation of Toronto, Centre Green Co-op | Richmond Hill |
|
 | Corinthian Masonic Lodge #481 | Newmarket |
|
 | Cornerstone Christian Community Church, Cornerstone Pantry | Markham |
|
 | Cornerstone to Recovery | Newmarket |
|
 | COSTI Immigrant Services, CBAO Seniors Day Program | Vaughan |
|
 | COSTI Immigrant Services, COSTI Employment Services | Vaughan |
|
 | COSTI Immigrant Services, COSTI Family and Mental Health Services Centre | Vaughan |
|
 | COSTI Immigrant Services, Markham North Welcome Centre, Language & Skills Training Services | Markham |
|
 | COSTI Immigrant Services, Richmond Hill Welcome Centre, Language and Skills Training Services | Richmond Hill |
|
 | COSTI Immigrant Services, Vaughan - Rutherford Road, Ontario Employment Services | Vaughan |
|
 | Counselling Services for York Region | Vaughan |
|
 | Country Casa Montessori Daycare and Academy | Whitchurch-Stouffville |
|
 | Country Living Retirement Home | Mount Albert |
|
 | CPAP Clinic, Vaughan Location | Vaughan |
|
 | CPAP Direct, CPAP Direct Richmond Hill Store | Richmond Hill |
|
 | CPAP Fit, CPAP Fit - Richmond Hill | Richmond Hill |
|
 | Creating Alternatives Day Program | Vaughan |
|
 | Credit Canada Debt Solutions, Head Office/North York Office | Ontario |
|
 | Crescent Village Housing Corporation | Richmond Hill |
|
 | Crime Stoppers of York Region, Canadian Crime Stoppers Association | Newmarket |
|
| Crohn's and Colitis Canada York Region Chapter | Richmond Hill |
|
 | Cross-Cultural Community Services Association, The, TCCSA York Centre | Markham |
|
 | Crosslands Church | Newmarket |
|
 | Crosslands Church, Community Meal | Newmarket |
|
| Culture Bridges Initiatives | Newmarket |
|
 | Curtain Club Theatre (The) | Richmond Hill |
|
 | Custom Comfort | Aurora |
|
| Cyber Smart Canada, Mailing Address | York Region |
|
| Cycle Newmarket | Newmarket |