| T J's Taxi, Listowel - Mailing Address | North Perth |
| T J's Taxi, Wingham - Mailing Address | North Huron |
| Table Soup Kitchen Foundation (The), 11 Hanes St, Table Men's Hostel | Huntsville |
| Table Soup Kitchen Foundation (The), 9 Hanes St, Table Food Bank and Exchange Store | Huntsville |
| Talk is Free Theatre | Barrie |
| Talk is Free Theatre, Theatre Day Camp | Barrie |
| Tara Area Food Bank | Arran-Elderslie |
| Tara Curling Club | Arran-Elderslie |
| Tarion Warranty Corporation, Ontario New Home Warranty Program | Toronto Downtown |
| Tay Hydro, Tay Township | Tay |
| Tay, Township of, Canine Control, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, Fire Department, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, No physical address, Rest Stations for Extreme Weather Relief | Tay |
| Tay, Township of, Port McNicoll Library Branch, Public Library, Port McNicoll Branch | Tay |
| Tay, Township of, Port McNicoll, Port McNicoll Community Centre | Tay |
| Tay, Township of, Sports and Recreation Programs, Victoria Harbour - Tay Municipal Office | Tay |
| Tay, Township of, Theo and Elaine Bernard Branch, Victoria Harbour, Public Library, Theo and Elaine Bernard Branch, Victoria Harbour | Tay |
| Tay, Township of, Victoria Harbour, Oakwood Park Community Centre | Tay |
| Tay, Township of, Waubaushene Library Branch, Public Library, Waubaushene Branch | Tay |
| Tay, Township of, Waubaushene, Department of Recreation and Culture - The Benny Club | Tay |
| Technical Training Group (Stratford & Area), Technical Training Group, Technical and Skilled Trades Training | Stratford |
| Technical Training Group (Stratford & Area), Welder, Metal Fabricator and General Machinist Apprenticeship Training, Technical Training Group | Stratford |
| Tecumseth and West Gwillimbury Historical Society | Bradford West Gwillimbury |
| Teddy Bears Picnic Children's Centre | Clearview (Simcoe County) |
| Telecare Distress Centre of Peterborough | Peterborough |
| Telecare Distress Line of Greater Simcoe, Orillia | Orillia |
| Telemed MD, Brighton, Telemed Brighton | Brighton (Municipality of) |
| Telemed MD, Grafton, Walk-in Clinic | Grafton |
| Temple Hill United Church | Grey Highlands |
| Terry Fox Run, Barrie | Barrie |
| Terry Fox Run, Tudhope Park 2023, Terry Fox Run - Orillia | Orillia |
| Tetra Society of North America, Mailing Address, Northern Ontario Chapter | Oro-Medonte |
| Thames River Paddling Club, Wildwood Conservation Area | St Marys |
| The Abundance Project | Trent Hills |
| The AIDS Committee of North Bay and Area, South River, Mobile Outreach | South River |
| The Bridge, Drop-In at The Bridge | Kincardine |
| The Canadian Canoe Museum, Canadian Canoe Museum | Peterborough |
| The Children's Foundation, Hastings, Northumberland & Prince Edward County | Cobourg |
| The common roof, Barrie | Barrie |
| The common roof, Orillia | Orillia |
| The Corporation of First Baptist Church, Barrie, Barrie | Barrie |
| The Farmers' Toolbox, Online / Web Service | Perth |
| The Friends of Awenda Park, Friends of Awenda Park | Tiny |
| The Georgian Cycle & Ski Trail Association | Collingwood |
| The Good Latch | Barrie |
| The Grey Bruce We C.A.R.E Project | Owen Sound |
| The Help Centre, Housing Support | Cobourg |
| The Help Centre, Income Assistance | Cobourg |
| The Help Centre | Cobourg |
| The HUB | Huntsville |
| The Karma Project Community Food Co-operative, Seed Youth Program | Port McNicoll |
| The Kinder Garden Children's Centre for Excellence and Early Education | Essa |
| The LearningHUB, Online/Web | North Huron |
| The Lighthouse, Orillia, Community Services | |
| The Lighthouse, Orillia, Emergency Shelter | |
| The Lighthouse, Orillia, Supportive Housing | Orillia |
| The Little Green Grocery, Stratford | Stratford |
| The Living Wish Foundation, No physical location | Wasaga Beach |
| The Local Community Food Centre, St. Marys, Nourish Market | St Marys |
| The Local Community Food Centre | Stratford |
| The Local Community Food Centre, Emergency Financial Assistance - Hydro | Stratford |
| The McKinnon Centre, Mailing Address | Stratford |
| The Medical Centre, Ontario Breast Screening Program | Peterborough |
| The Mount Community Centre | Peterborough |
| The Municipality of Whitestone, Fire Department | Whitestone |
| The Municipality of Whitestone, Municipal Office | Whitestone |
| The Original Spaghetti House Pizzeria, Peterborough, Thanksgiving Meal | Peterborough |
| The Probus Club of Stratford, Army Navy & Air Force Veterans | Stratford |
| The Rainbow Club of South Georgian Bay, Collingwood | Collingwood |
| The Reading Room | |
| The Reuben R. Sallows Gallery | Goderich |
| The Salvation Army Peterborough, Christmas Food Assistance and Toy Shop, Peterborough - Simcoe St | Peterborough |
| The Salvation Army Peterborough, Correctional and Justice Services, Anger and Conflict Management Program, Peterborough - Simcoe St | Peterborough |
| The Salvation Army Peterborough, Correctional and Justice Services, Peterborough - Simcoe St | Peterborough |
| The Salvation Army Peterborough, Peterborough - Simcoe St, Church | Peterborough |
| The Salvation Army Peterborough, Peterborough - Simcoe St, Community and Family Services | Peterborough |
| The Salvation Army, Goderich/Clinton, Christmas Hampers, Clinton - 32 Albert St | Central Huron |
| The Salvation Army, Goderich/Clinton, Christmas Hampers, Goderich - 303 Suncoast Dr E | Goderich |
| The Salvation Army, Goderich/Clinton, Clinton - 32 Albert St, Community and Family Services, Clinton | Central Huron |
| The Salvation Army, Goderich/Clinton, Coats For Community, Mailing Address Only | |
| The Salvation Army, Goderich/Clinton, Goderich - 303 Suncoast Dr E, Community and Family Services, Goderich | Goderich |
| The Salvation Army, Goderich/Clinton, Goderich - 303 Suncoast Dr E, Correctional and Justice Services and Community Alternatives for Youth | Goderich |
| The Salvation Army, Goderich/Clinton, Goderich - 303 Suncoast Dr E, The Salvation Army | Goderich |
| The Salvation Army, Goderich/Clinton, Thrift Store, Goderich - 309 Suncoast Dr E | Goderich |
| The Sharing Place Food Centre, Food Hamper Program, Orillia | Orillia |
| The Sharing Place Food Centre, Orillia, The Sharing Place Food Bank | Orillia |
| The Shelburne Transporter, Shelburne, Medical Transportation Services | Shelburne |
| The Stride Clinic, Barrie | Barrie |
| The Terry Fox Run in the Heart of Georgian Bay | Midland |
| The Uptown Church | Orangeville |
| The Uptown Church, Orangeville - 207 Broadway St, Support Groups | Orangeville |
| The Uptown Church, Orangeville - 219 Broadway St, Church Services | Orangeville |
| The Uptown Church, The Lighthouse, Orangeville - 207 Broadway St | Orangeville |
| Theatre by the Bay, Barrie Theatre Lab | Barrie |
| Theatre by the Bay | Barrie |
| Therapeutic Paws of Canada, Mailing Address | Barrie |
| Third Age Barrie Lifelong Learning Association, Mailing Address | Barrie |
| Thornbury Builders and Trades Association, Mailing Address | Blue Mountains |
| Thornbury Business Improvement Area | Thornbury |
| Thornbury Pharmasave | Thornbury |
| Thornton Community Food Bank | Essa |
| Three Links Cooperative Housing (Barrie), Barrie, Three Links Cooperative Housing | Barrie |
| Three Times a Charm Clothing Depot | Brighton (Municipality of) |
| Thrive Housing and Support | Peterborough |
| Thrive: Northumberland Coalition to End Violence Against Women, Women's Resource Drop-In Centre | Cobourg |
| Tillsonburg Power & Sail Squadron, Stratford Teaching Satelite, No physical address | Stratford |
| Timothy Christian School | Barrie |
| Tiny Hoppers Barrie, Barrie - Big Bay Point Rd, Childcare Centre | Barrie |
| Tiny Township Lions Club | Tiny |
| Tiny, Township of | Tiny |
| Tiny, Township of, 817 County Rd 6 S, Emergency Services Department | Tiny |
| Tiny, Township of, 8340 Hwy 93 W, Recreation Department - Wyebridge Community Centre | Tiny |
| Tiny, Township of, 91 Concession Rd 8 E, Recreation Department - Township of Tiny Community Centre | Tiny |
| Tiny, Township of, Municipal Office | Tiny |
| Tiny, Township of, Municipal Office, Recreation & Community | Tiny |
| Tiny-Shiny Childcare | Clearview (Simcoe County) |
| TLC Muskoka Home Health Care, Mailing Address | Toronto |
| Toastmasters, Grey, Bruce and Collingwood | Grey County |
| Tobermory Chamber of Commerce and Tourist Information Centre | Northern Bruce Peninsula |
| Tobermory Food Bank | Tobermory |
| Tobermory United Church, Settlement Church, The Thrift Shop | Northern Bruce Peninsula |
| Tobermory United Church | Northern Bruce Peninsula |
| TOK Coachlines | Vaughan |
| Tollendale Village | Barrie |
| Tolmie Presbyterian Free Community Lunch | Port Elgin |
| Tom Thomson Art Gallery | Owen Sound |
| Toothpicks, Mobile Dental Practice | Springwater |
| TOPS, Huron County Chapters | Southwestern Ontario |
| TOPS, Perth County Chapters | Stratford |
| TOPS. Barrie | Barrie |
| Toronto Abortion Clinic (The) | Toronto Downtown North |
| Tottenham Co-Op Preschool | New Tecumseth |
| Tottenham United Church | New Tecumseth |
| Tourette Canada, Peterborough and Kawartha Lakes Area Contact | Peterborough |
| Tourism Barrie | Barrie |
| Tourism Goderich, Tourism Information Centre | Goderich |
| Tourism Simcoe County, No Physical Address, Simcoe County Farm Fresh | Simcoe |
| Towards Recovery Clinic, Barrie, Towards Recovery Clinic, Barrie | Barrie |
| Towhee Residential Summer Program | Haliburton |
| Town of Innisfil, Innisfil ideaLAB & Library - Cookstown Branch, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Innisfil ideaLAB & Library - Lakeshore Branch, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Innisfil Municipal Office, Town Hall | Innisfil |
| Town of Innisfil, Innisfil Recreational Centre, Troy Scott Community Fridge | Innisfil |
| Town of Innisfil, Recreation Programs and Summer Day Camps, Town Hall | Innisfil |
| Town of St Marys Home Support Services, Community Dining Programs | St Marys |
| Town of St Marys Home Support Services, Home Help Referral Program | St Marys |
| Town of St Marys Home Support Services, Meals on Wheels | St Marys |
| Town of St Marys Home Support Services, Shopping Services | St Marys |
| Town of St Marys Home Support Services, Telephone Reassurance | St Marys |
| Town of St Marys Home Support Services, Foot Care Clinics | St Marys |
| Town of St Marys Home Support Services | St Marys |
| Town of St Marys Home Support Services, Volunteer Visiting | St Marys |
| Town of St Marys Home Support Services, Wellness and Fitness Programs | St Marys |
| Township of Algonquin Highlands, Algonquin Highlands. Fire Services, Fire Services | Algonquin Highlands |
| Township of Algonquin Highlands, Dorset Recreation Centre - Main St, Parks, Recreation and Trails - Dorset Recreation Centre | Lake of Bays Township |
| Township of Algonquin Highlands, Public Works - Waste Disposal Sites | Minden |
| Township of Algonquin Highlands, Haliburton - North Shore Rd, Municipal Office | Haliburton |
| Township of Algonquin Highlands, Maple Lake Landfill, Public Works - Waste Disposal Sites | Algonquin Highlands |
| Township of Algonquin Highlands, Oxtongue Lake Landfill, Public Works - Waste Disposal Sites | Lake of Bays Township |
| Township of Algonquin Highlands, Pine Springs Landfill, Public Works - Waste Disposal Sites | Algonquin Highlands |
| Township of Algonquin Highlands, Trails - Hwy 35 N, Parks, Recreation and Trails - Trails | Algonquin Highlands |
| Township of Amaranth. Municipal Office | Amaranth |
| Township of Ashfield-Colborne-Wawanosh | Goderich |
| Township of Georgian Bay Public Libraries, Honey Harbour Public Library | Georgian Bay Township |
| Township of Georgian Bay Public Libraries, MacTier Public Library | Georgian Bay Township |
| Township of Georgian Bay Public Libraries, Port Severn Public Library | Georgian Bay Township |
| Township of Howick. Municipal Office | Howick |
| Township of Huron-Kinloss Tourism Office & Lucknow Chamber of Commerce, Lucknow & District Sports Complex, Tourism Office | Huron-Kinloss |
| Township of Nipissing. Municipal Office | Nipissing |
| Township of Severn, Building Department. Planning and Development, Orillia | Severn |
| Township of Severn, Coldwater, Severn Township Public Library | Severn |
| Township of Severn, Municipal Law Enforcement. Planning and Development, Orillia | Severn |
| Township of Severn, No physical address, Rest Stations for Extreme Weather Relief | Severn |
| Township of Severn, Orillia, Administration Office | Severn |
| Township of Severn, Orillia, Fire and Emergency Services | Severn |
| Township of Severn, Planning Department, Orillia | Severn |
| Township of Severn, Recreation and Culture Advisory Committee, Orillia | Severn |
| Township of Severn, The Public Works and Utilities Department, Orillia | Severn |
| Township of Severn, Washago Community Centre | Severn |
| Toys for Kids - Wasaga Beach | Wasaga Beach |
| Tracks Employment and Resource Services of Georgian Bay | Collingwood |
| Tracks Employment and Resource Services of Georgian Bay, Collingwood, Integrated Employment Services | Collingwood |
| Tracks Employment and Resource Services of Georgian Bay, Collingwood, Opportunities | Collingwood |
| Training for Life, Collingwood - No Physical Address | Collingwood |
| Transition House | Cobourg |
| Transplant Ambassadors, Transplant Ambassadors Program | London |
| TransUnion of Canada, Burlington, Consumer Relations | Burlington |
| Trauma and Life Stress Reduction | Barrie |
| Traynor Homestead Enterprises, Mobile Service | Meaford |
| Treasured Kids School | Oro-Medonte |
| Tree Museum (The) | Gravenhurst |
| Trent Child Care, Bridgenorth United Church, Infant Care | Selwyn Township |
| Trent Child Care, Bridgenorth United Church, Preschool Care | Selwyn Township |
| Trent Child Care, Bridgenorth United Church, School Age Care | Selwyn Township |
| Trent Child Care, Bridgenorth United Church, Toddler Care | Selwyn Township |
| Trent Child Care, Buckhorn, Preschool Care | Buckhorn |
| Trent Child Care, Buckhorn, School Age Care | Buckhorn |
| Trent Child Care, Buckhorn, Toddler Care | Buckhorn |
| Trent Child Care, Chemong School, School Age Care | Selwyn Township |
| Trent Child Care, Immaculate Conception School, School Age Care | Peterborough |
| Trent Child Care, Kaawaate, Infant Care | Peterborough |
| Trent Child Care, Kaawaate, Preschool Care | Peterborough |
| Trent Child Care, Kaawaate, School Age Care | Peterborough |
| Trent Child Care, Kaawaate, Toddler Care | Peterborough |
| Trent Child Care, Monsignor O'Donoghue Elementary School, School Age Care | Peterborough |
| Trent Child Care, St Paul's School, School Age Care | Peterborough |
| Trent Child Care, Trent University Campus, Infant Care | Peterborough |
| Trent Child Care, Trent University Campus, Preschool Care | Peterborough |
| Trent Child Care, Trent University Campus, Toddler Care | Peterborough |
| Trent Hills Community GAIN Team | Trent Hills |
| Trent Hills Family Health Team | Trent Hills |
| Trent Hills Public Library, Campbellford | Trent Hills |
| Trent Hills Public Library, Hastings | Trent Hills |
| Trent Hills Public Library, Warkworth | Trent Hills |
| Trent Hills. Municipal Office, Campbellford - Front St S, Municipality of Trent Hills | Trent Hills |
| Trent Hills. Municipal Office, Campbellford - Saskatoon Ave, Parks and Recreation - Campbellford Skatepark | Trent Hills |
| Trent Hills. Municipal Office, Campbellford Station, Trent Hills Fire Department | Trent Hills |
| Trent Hills. Municipal Office, Campbellford-Seymour Arena, Parks and Recreation - Campbellford-Seymour Arena and Community Centre | Trent Hills |
| Trent Hills. Municipal Office, Hastings - Elgin St, Hastings Field House | Trent Hills |
| Trent Hills. Municipal Office, Hastings Station, Trent Hills Fire Department | Trent Hills |
| Trent Hills. Municipal Office, Heritage Committee, Campbellford - Front St S | Trent Hills |
| Trent Hills. Municipal Office, Parks and Recreation, Campbellford - Front St S | Trent Hills |
| Trent Hills. Municipal Office, Warkworth Arena, Parks and Recreation - Warkworth Arena and Community Centre | Trent Hills |
| Trent Hills. Municipal Office, Warkworth Station, Trent Hills Fire Department | Trent Hills |
| Trent Lakes Outreach Centre | North Kawartha |
| Trent Lakes. Municipal Office, Fire and Rescue | Trent Lakes |
| Trent Lakes. Municipal Office, Trent Lakes Public Library - Buckhorn Branch, Trent Lakes Public Library | North Kawartha |
| Trent Lakes. Municipal Office | Trent Lakes |
| Trent Regional Sleep Clinic | Peterborough |
| Trent University, Blackburn Hall - 1600 West Bank Dr Suite 111, Student Wellness Centre - Student Health Services | Peterborough |
| Trent University, Blackburn Hall - 1600 West Bank Dr, Suite 132, Student Wellness Centre - Student Accessibility Services (SAS) | Peterborough |
| Trent University, Champlain College - 1600 West Bank Dr, Office of Student Affairs | Peterborough |
| Trent University, Nassau Campus - 1600 West Bank Dr, CC302, Trent International Student Association | Peterborough |
| Trent University, Peterborough - 1600 West Bank Dr, Office of the Registrar Admissions | Peterborough |
| Trent University, Peterborough - 1600 West Bank Dr, Trent University - Administration | Peterborough |
| Trent University, Trent Student Centre - 1680 West Bank Dr, Trent Community Research Centre, Community-Based Research | Peterborough |
| Trent Valley Archives | Peterborough |
| Trent Valley Literacy Association | Peterborough |
| Trillium Lakelands District School Board | Kawartha Lakes |
| Trillium Lakelands District School Board, Bracebridge Adult & Alternate Education Centre, Adult High School Diploma Program | Bracebridge |
| Trillium Lakelands District School Board, Fenelon Falls - Adult and Alternate Education Centre, Adult High School Diploma Program | Fenelon Falls |
| Trillium Lakelands District School Board, Gravenhurst Adult & Alternate Education Centre, Adult High School Diploma Program | Gravenhurst |
| Trillium Lakelands District School Board, Haliburton Alternative Education and Training Centre, Adult High School Diploma Program | Haliburton |
| Trillium Lakelands District School Board, Huntsville Adult & Alternate Education Centre, Adult High School Diploma Program | Huntsville |
| Trillium Lakelands District School Board, Lindsay Adult & Alternate Education Centre | Lindsay |
| Trillium Lakelands District School Board, Lindsay Adult & Alternate Education Centre, Adult High School Diploma Program | Lindsay |
| Trillium Lakelands District School Board, Lindsay Adult & Alternate Education Centre, Literacy and Basic Skills | Lindsay |
| Trillium Lakelands District School Board, Lindsay Adult & Alternate Education Centre, Personal Support Worker Program | Lindsay |
| Trillium Lakelands District School Board, Ontario Youth Apprenticeship Program, Lindsay - County Rd 36 | Kawartha Lakes |
| Trillium Manor | Orillia |
| Trinity - St. Andrew's United Church, Clothing Depot | Brighton (Municipality of) |
| Trinity - St. Andrew's United Church | Brighton (Municipality of) |
| Trinity Anglican Church, Barrie | Barrie |
| Trinity Anglican Church, Barrie, Trinity Hill Top Day Camp | Barrie |
| Trinity Anglican Church, Blyth | North Huron |
| Trinity Anglican Church, Bradford | Bradford West Gwillimbury |
| Trinity Christian Reformed Church, Goderich, Fishes and Loaves | Goderich |
| Trinity Christian Reformed Church, Goderich | Goderich |
| Trinity Housing of Cobourg Corporation, Trinity Place | Cobourg |
| Trinity St. James Anglican Church, Bayfield | Bluewater |
| Trinity United Church, Cobourg | Cobourg |
| Trinity United Church, Collingwood, Food Pantry | Collingwood |
| Trinity United Church, Collingwood | Collingwood |
| Trio Fertility | Toronto Downtown |
| Trish's Wish Foundation | Kawartha Lakes |
| Trivitt Memorial Anglican Church | South Huron |
| Trout Creek Friendship Club | |
| Trout Creek Lions Club | |
| Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
| Tuktu Care | Markham |
| Turbitt Pharmasave | Owen Sound |
| Turf King Georgian Triangle | Wasaga Beach |
| TVCC, Owen Sound, Child and Youth Rehabilitation Services, Owen Sound | Owen Sound |
| TVCC, Stratford, Child and Youth Rehabilitation Services, Stratford | Stratford |
| TVO ILC | Toronto |
| TVO ILC, TVO Mathify | Toronto |