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 | D&K Footcare Mobile Services | Bradford West Gwillimbury |
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 | D. Freer and Associates, Barrie Office, Physiotherapy and Massage Therapy, Barrie Office | Barrie |
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| Daisy A Day Home Care, Barrie | Barrie |
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 | Dancers Studio (The) | Midland |
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 | Danube Seniors Leisure Centre | Bradford West Gwillimbury |
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 | Daughters of Isabella, Penetanguishene, Daughters of Isabella - Penetanguishene | Penetanguishene |
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 | Days For Girls, No Physical Address, Days For Girls Barrie | Barrie |
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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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 | Defined Spaces | Bracebridge |
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 | Delta Health Clinics, Barrie - Grove St E, Opioid Addiction / Dependence Treatment | Barrie |
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 | Delta Health Clinics, Barrie - Leacock Dr, Opioid Addiction / Dependence Treatment | Barrie |
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 | Delta Health Clinics, Barrie - Wellington St W, Opioid Addiction / Dependence Treatment | Barrie |
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 | Developmental Services Ontario Central East Region, York Support Services Network - Central East Region | Aurora |
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 | Developmental Services Ontario, Central East Region, Central East Region | Aurora |
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 | Diabetes Canada | Toronto Downtown Central |
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 | Diabetes Canada, D-Camps Ontario | Huntsville |
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 | Dietitians of Canada | Toronto Downtown Central |
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| Dietitians of Canada - UnlockFood.ca | Toronto Downtown Central |
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 | Discovery Child Care Centre, Barrie - Thrushwood Dr, Child Care Centre | Barrie |
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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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 | Divine Landscape, Mobile Service, WasagaSnow.ca | Wasaga Beach |
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 | Divine Living, Mailing address | Midland |
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 | Doane House Hospice | Newmarket |
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 | Donaven Renovations, Lawn Care and Snow Blowing, Mobile Service | Wasaga Beach |
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 | Dorvict Home and Health Care Services, Barrie | Barrie |
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 | Doug's Home and Lawn Care, Mailing address | Wasaga Beach |
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 | Doula Group (The) | Barrie |
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 | Doula Services, Labour and Delivery Support | Midland |
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 | Down Syndrome Association of Simcoe County, Mailing Address | Barrie |
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 | Downtown Barrie BIA, Barrie | Barrie |
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 | Downtown Midland Business Improvement Area | Midland |
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 | Downtown Orillia Management Board | Orillia |
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 | Dr Neil Patrick, Collingwood Chiropractic | Collingwood |
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 | Dr Neil Patrick, Creemore Chiropractic | Clearview (Simcoe County) |
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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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 | Drayton Entertainment, King's Wharf Theatre | Penetanguishene |
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 | Dress for Success, Barrie | Barrie |
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 | Driverseat | Barrie |
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 | DriveTest, Collingwood, Driver Examination Centre, Collingwood | Collingwood |
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 | DriveTest, Orillia, Driver Examination Centre | Orillia |
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 | DriveTest / Serco Des, Barrie, Driver Examination Centre | Barrie |
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 | DriveTest/Serco Des | Barrie |
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 | D-tek-TION Security Systems, Mobile Service | Barrie |
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 | Ducks Unlimited Canada, Barrie | Barrie |
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 | Dufferin Simcoe Land Stewardship Network | Mulmur |
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 | Duntroon Day Care | |
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 | Dying with Dignity Canada | Toronto |
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 | Dynacare Medical Laboratory, Huronia Medical Centre Laboratory | Midland |
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 | Dynamic Neurophysiotherapy, In-Home Physiotherapy | Barrie |