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 | Dar Foundation | Oakville |
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 | Dar Foundation, Food Program | Oakville |
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 | Dawn of Angels Health | Burlington |
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 | DEBRA Canada | Oakville |
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 | Debtors Anonymous | Oakville |
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 | Deliverance Tabernacle Church of God | Burlington |
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 | Delmanor, Glen Abbey, Retirement Residence | Oakville |
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 | Derry Pharmacy | Milton |
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 | Destiny Care Services | Mississauga |
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 | Developmental Services Ontario Central West Region, Single Point of Access for Adult Developmental Services | Milton |
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| Diagnostic Imaging, Halton Hills | Halton Hills |
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| Diagnostic Imaging, Oakville | Oakville |
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| Dietitians of Canada - UnlockFood.ca | Toronto Downtown Central |
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 | directSmiles, Mobile Dental Hygiene Services | Oakville |
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 | Distress and Crisis Ontario | Waterloo |
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| Distress Centre Halton | Halton Region |
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 | Distress Centres of Greater Toronto, Survivor Support Program, Toronto Office | Toronto |
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 | Doctor's Office Urgent Care Clinic, Walk-in Medical Clinic | Burlington |
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 | Doris Care Services | Mississauga |
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 | Dorval Medical Family Health Team | Oakville |
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 | Dr. Bob Kemp Hospice, Centre for Hospice Palliative Care | Hamilton |
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 | DriveAgain, Driver Assessment Services | Burlington |
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 | DriveTest Centre, Burlington | Burlington |
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 | Drivetest Centre, Oakville | Oakville |
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 | DriveTest Centre, Guelph | Guelph |
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 | Drury Lane Theatrical Productions | Burlington |
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 | Dundas Neyagawa Medical Centre and Pharmacy | Oakville |
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 | Dying with Dignity Canada | Toronto |
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 | Dynacare, Oakville - Old Bronte Rd, Laboratory and Health Services Centre | Oakville |
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 | Dynacare, Oakville - Bristol Circle, Laboratory and Health Services Centre | Oakville |
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 | Dynacare, Acton - Eastern Rd, Medical Laboratory Services | Halton Hills |
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 | Dynacare, Milton, Laboratory and Health Services Centre | Milton |
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 | Dynacare, Oakville - Oak Park Blvd, Laboratory and Health Services Centre | Oakville |
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 | Dystonia Medical Research Foundation Canada | Toronto Downtown Central |