| | Organization Name(s) | Located In |
 | Taiwan Entrepreneurs Society Taipei/Toronto | Scarborough |
| | Take Off Pounds Sensibly, Markham Chapter | Markham |
| Taoist Tai Chi Society of Canada, Markham Club | Markham |
| Taylor Christmas Tree Farm | Stouffville |
| Temperanceville United Church | Aurora |
| Temple Har Zion | Thornhill |
| Temple Kol Ami | Thornhill |
| Terry Fox Run, Richmond Hill | Richmond Hill |
| Terry Fox Run 2012, Markham/Unionville | Unionville |
| | Tetra Society of North America, York Region Chapter | Toronto |
| The Access Program, York Region District School Board | Richmond Hill |
| The Arthritis Research Foundation | Greater Toronto Area |
| the bridge, a markham community church | Markham |
| The Career Connection, Employment | Barrie |
| The Children's Aid Foundation of York Region | Vaughan |
| The Children's Wish Foundation of Canada, National Office, Ontario Chapter | Ajax |
| The Cross-Cultural Community Services Association, TCCSA | Markham |
| The Education Academy | Markham |
| The Era (Newmarket), The Banner (Aurora) | Newmarket |
| The Hong Kong-Canada Business Association | Toronto |
| | The Leprosy Mission Canada | Markham |
| The Liberal Newspaper, York Region Newspaper Group | Richmond Hill |
| The Organ Donation and Transplant Association of Canada, Organ Donations | Toronto |
| The Peer Project-YAY, York Region | North York |
| The Vaughan Citizen Newspaper | Vaughan |
| Theatre Aurora | Aurora |
| Thomson Court Apartments | Markham |
| | Thornhill African Caribbean Canadian Association | Vaughan |
| Thornhill Archives and Special Collections | Thornhill |
| Thornhill Baptist Church | Thornhill |
| | Thornhill Baseball Club | Vaughan |
| | Thornhill Baseball Club (Hardball) | Thornhill |
| | Thornhill Cemetery | Thornhill |
| Thornhill Chiropractic and Wellness Centre | Thornhill |
| Thornhill Community Band | Thornhill |
| Thornhill Community Hockey League | Thornhill |
| Thornhill Conservation District Ratepayers Association | Markham |
| Thornhill Garden & Horticultural Society | Thornhill |
| Thornhill Multisport | Markham |
| Thornhill Ontario Early Years Centre | Thornhill |
| Thornhill Oxford Learning, Thornhill Branch | Thornhill |
| Thornhill Seniors Club | Thornhill |
| | Thornhill Slo-Pitch League | Thornhill |
| Thornhill Soccer Club | Thornhill |
| Thornhill Square Shopping Centre | Thornhill |
| Thornhill Swing Band | Thornhill |
| Thornhill United Church | Thornhill |
| Thornhill United Church, Clothing Centre | Thornhill |
| | Thornhill Village Festival | Thornhill |
| Thyroid Foundation of Canada | London |
| Timber Creek Golf and Family Fun Centre | Stouffville |
| TIMES MEDICAL CLINIC | Richmond Hill |
| Toastmaster Club, Stouffville | Stouffville |
| Toastmasters Club, Markham | Markham |
| Toastmasters Club, Thornhill | Thornhill |
| Top'o the Hill (Co-operative) | Richmond Hill |
| Toronto and Region Conservation Authority, Albion Hills Conservation Area | Caledon |
| Toronto and Region Conservation Authority, Black Creek Pioneer Village | Toronto |
| Toronto and Region Conservation Authority, Boyd Conservation Area | Woodbridge |
| Toronto and Region Conservation Authority, Claremont Field Centre | Toronto |
| Toronto and Region Conservation Authority, Environmental Volunteer Network | Toronto |
| Toronto and Region Conservation Authority, Heart Lake Conservation Area | Brampton |
| Toronto and Region Conservation Authority, Kortright Centre for Conservation | Woodbridge |
| | Toronto and Region Conservation Authority, Lake St. George Field Centre | Richmond Hill |
| | Toronto and Region Conservation Authority, Maple Sugar | Greater Toronto Area |
| Toronto and Region Conservation Authority, Petticoat Creek Conservation Area | Pickering |
| Toronto and Region Conservation Authority - Bruces Mill Conservation Area | Stouffville |
| Toronto Aspirals Rhythmic Gymnastics Center, Canadiana School of Rhythmic Gymnastics | Richmond Hill |
| Toronto Botanical Garden | Toronto |
| Toronto Buttonville Municipal Airport | Markham |
| Toronto Chinese Community Church | Markham |
| Toronto City Centre Airport | Toronto |
| Toronto Coach Terminal | Toronto |
| Toronto Community News | Toronto |
| Toronto District Christian High School | Woodbridge |
| Toronto District School Board, Next-Steps Employment Centre | Woodbridge |
| Toronto General Hospital | Toronto |
| Toronto Grace Health Centre | Toronto |
| Toronto Humane Society | Toronto |
| Toronto Immanuel Chinese Baptist Church | Markham |
| Toronto Ling Liang Church | Markham |
| Toronto Montessori School | Richmond Hill |
| Toronto Parents of Multiple Births Association | Toronto |
| Toronto Pearson International Airport | Toronto |
| | Toronto Police | Toronto |
| Toronto Polo Club, Richmond Hill Branch | Richmond Hill |
| | Toronto Public Health Department | Toronto |
| Toronto Public Library, North York Central Library | Toronto |
| Toronto Public Library, Toronto Reference Library | Toronto |
| | Toronto Rape Crisis Centre, Multicultural Women Against Rape | Toronto |
| Toronto Real Estate Board | Greater Toronto Area |
| Toronto Recyling Inc. - E-Waste Recycling | Richmond Hill |
| | Toronto Scottish Country Dancing Association | Toronto |
| Toronto Ski Hawks | Aurora |
| Toronto Star | Toronto |
| | Toronto Titans Field Hockey Club | Markham |
| Toronto Transit Commission | Toronto |
| Toronto Transit Commission, Customer Information and Route Search | Toronto |
| Toronto Transit Commission, Wheel Trans | Toronto |
| Toronto Waldorf School | Thornhill |
| Toronto Wildlife Centre | Toronto |
| Toronto Workers Health and Safety Legal Clinic | Toronto |
| Toronto, City Of | Toronto |
| | Toronto, City of, Toronto Island Ferry Service | Toronto |
| Tourette Syndrome Association of Ontario | Barrie |
| Tourism and Parks New Brunswick | New Brunswick |
| Tourism British Columbia | Victoria |
| | Tourism Nova Scotia | Nova Scotia |
| | Tourism Quebec | Montreal |
| Tourism Saskatchewan | Regina |
| Tourism Toronto | Toronto |
| Tourism Toronto, Metropolitan Toronto Convention and Visitors' Association | Toronto |
| Town of Aurora Heritage Advisory Committee | Aurora |
| Town of Newmarket | Newmarket |
| Towns of York Toastmasters Club | Aurora |
| Training Renewal Foundation | Concord |
| Transit Georgina | Georgina |
| Transport Canada, Road And Motor Vehicle Traffic Safety Branch | Ottawa |
| Travel Lodge | Richmond Hill |
| Travel Manitoba | Winnipeg |
| Travellers Aid Society of Toronto | Toronto |
| Treasures | Richmond Hill |
| Trillium Gift of Life Network | Toronto |
| Trinity Anglican Church | Aurora |
| Trinity Anglican Church, Clothes Closet | Aurora |
| Trinity Anglican Church, The Welcome Table | Aurora |
| Trinity Square | Markham |
| Trinity United Church Newmarket, Lunch At My Place | Newmarket |
| Tristar Gymnastics Club | Markham |
| Truth Tabernacle | Markham |
| Turkish Community Heritage Centre of Canada, TCHCC, Turkish Community Centre | Richmond Hill |
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