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| D&K Footcare Services | Bradford West Gwillimbury |
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| Daisy A Day Home Care, Barrie | Barrie |
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| Daisy A Day Home Care, Barrie, Daisy Acres Assisted Living | 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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| 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, Your Support Services Network - Central East Region | Aurora |
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| Developmental Services Ontario, Central East Region, Aurora Office | 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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| 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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| 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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| 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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| Dr. Dianne Maing Psychologist, Barrie | Barrie |
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| Dragon Boat Barrie (Ontario), Mailing Address | Barrie |
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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 |
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| DriveTest / Serco Des, Barrie, Driver Examination Centre | 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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| 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, Mobile Service, Mobile Physiotherapy | Barrie |