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 | Talk is Free Theatre | Barrie |
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 | Tania E. Kingston Psychotherapy | Barrie |
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 | Tarion Warranty Corporation, Ontario New Home Warranty Program | Toronto Downtown |
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 | Tecumseth and West Gwillimbury Historical Society | Bradford West Gwillimbury |
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 | Tecumseth Pines Homeowners Association | Tottenham |
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 | Telecare Distress Line of Greater Simcoe | Orillia |
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 | Telecare Distress Line of Greater Simcoe, Reassurance Call Program, Orillia | Orillia |
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 | Tetra Society of North America, Mailing Address, Northern Ontario Chapter | |
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 | The Blueberry Place | Tay |
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 | The Kinder Garden Children's Centre for Excellence and Early Education | Essa |
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 | The Lighthouse | Orillia |
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 | The Lighthouse, Orillia, Emergency Shelter and Community Meal Program | Orillia |
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 | The Lighthouse, Orillia, Shower and Laundry Program | Orillia |
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 | The Meeting House Alliston | Alliston |
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 | The Northern Appeal, No Physical Address | Barrie |
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 | The Sharing Place Food Centre, Orillia, The Sharing Place Food Bank | Orillia |
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 | The Well Community Chapel | New Tecumseth |
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 | Theatre by the Bay | Barrie |
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 | Theatre by the Bay, Barrie Theatre Lab | Barrie |
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 | Theatre Collingwood | Collingwood |
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 | Theatre Collingwood, March Break Drama Program | Collingwood |
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 | Thornton Community Food Bank | Essa |
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 | Thyroid Foundation of Canada | Ottawa (City of) |
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| Ticket Agencies | Barrie |
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 | Timothy Christian School | Barrie |
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 | TOPS | Angus |
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 | TOPS. Barrie | Barrie |
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| Tornado - Barrie South End, Barrie | Barrie |
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| Tornado - Barrie South End, Barrie, Disaster Financial Assistance | Barrie |
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| Tornado - Barrie South End, Barrie, Property Status and Clean Up Information | Barrie |
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 | Tottenham and District Christmas Hamper Program | Tottenham |
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 | Tottenham Co-Op Preschool | Tottenham |
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 | Tottenham United Church | New Tecumseth |
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 | Tourism Barrie, Southshore Community Centre | Barrie |
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 | Towards Recovery Clinic, Barrie | Barrie |
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 | TransUnion of Canada | Burlington |
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| Treblemakers (The) | Wasaga Beach |
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 | Trinity Anglican Church, Bradford | Bradford |
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 | Trinity United Church | Collingwood |
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 | Trinity United Church, Collingwood | Collingwood |
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 | Triple P Positive Parenting Program Network in Simcoe County and Muskoka | Simcoe County |
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 | Tuberous Sclerosis Canada Sclérose Tubéreuse | Barrie |
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 | TVO ILC | Toronto |