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 | D&K Footcare Mobile Services | Bradford West Gwillimbury |
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 | Danube Seniors Leisure Centre | Bradford West Gwillimbury |
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 | Deaf Access Simcoe Muskoka, Barrie Central Office, American Sign Language Classes | Barrie |
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 | Deaf Access Simcoe Muskoka, Barrie Central Office, American Sign Language Interpreting | Barrie |
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 | Deaf Access Simcoe Muskoka, Barrie Central Office, Community Support Services | Barrie |
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 | Deaf Access Simcoe Muskoka, Barrie Central Office | Barrie |
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 | Deaf Access Simcoe Muskoka, Barrie Central Office, Employment Services | Barrie |
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 | DeafBlind Ontario Services | Newmarket |
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| Dietitians of Canada - UnlockFood.ca | Toronto Downtown Central |
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 | Discovery Harbour, Penetanguishene | Penetanguishene |
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| Distance Education. Ontario Colleges of Applied Arts and Technology | Ontario |
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 | Doane House Hospice | Newmarket |
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 | Down Syndrome Association of Simcoe County, Mailing Address | Barrie |
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 | Dr. Dianne Maing Psychologist, Barrie | Barrie |
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 | Dragon Boat Barrie (Ontario), Mailing Address | Barrie |
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 | DriveTest / Serco Des | Barrie |
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 | Drysdale's Tree Farm | Essa |
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 | Dufferin Simcoe Land Stewardship Network | Mulmur |
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 | Dufferin, County of, Orangeville - Edelbrock Centre, Employment Resource Centres | Orangeville |
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 | Dying with Dignity Canada | Toronto |
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 | Dynamic Neurophysiotherapy, Mobile Service, Mobile Physiotherapy | Barrie |