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 | Dance Ability Movement (The), Milton - Dance Elite Studio | Milton |
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 | Dar Foundation | Oakville |
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 | Dar Foundation, Food Program | Oakville |
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 | Dare to be You | Burlington |
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 | Darling Home for Kids | Milton |
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 | Dawn of Angels Health | Burlington |
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 | Deaf Literacy Initiative | Georgetown |
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 | Dearcroft Montessori School, Licensed Child Care Centre | Oakville |
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 | Dearcroft Montessori School | Oakville |
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 | DEBRA Canada | Oakville |
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 | Debtors Anonymous | Oakville |
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| Debtors Anonymous | Toronto Downtown Central |
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 | Deliverance Tabernacle Church of God | Burlington |
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 | Delmanor Glen Abbey | Oakville |
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 | Derry Pharmacy | Milton |
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| Designated Driving Services - Companies Serving Halton | Halton Region |
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 | Determination Martial Arts, Rainbow Pals Summer Camp | Hamilton East |
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 | Developmental Services Ontario Central West Region, Halton Office - Milton | Milton |
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 | Diabetes Canada, Diabetes Canada - Central South Ontario Regional Leadership Centre | Dundas |
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 | Diabetes Canada, D-Camps Ontario | Huntsville |
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 | Diabetes Canada | Toronto Downtown Central |
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 | Diabetes Canada, Donation Program | Hamilton Mountain East |
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 | Diabetes Canada, Community Health Promotion and Partnerships | Halton Region |
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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 | Toronto Downtown Central |
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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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| Disaster Relief and Aid Organizations - Websites and Donor Lines, No Physical Location | Canada |
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| Distress and Crisis Ontario | Waterloo Region |
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| Distress Centre Halton | Halton Region |
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 | Divorce Canada, No Physical Address | Canada |
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 | Doctor's Office Walk-in Clinic Inside Walmart, Walk-in Medical Clinic | Burlington |
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 | Dog Rescuers | Oakville |
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 | Dolphins Swim Club | Oakville |
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 | Doors Open Burlington | Burlington |
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 | Dorval Medical Family Health Team | Oakville |
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 | Downtown Acton Business Improvement Area | Acton |
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 | Downtown Acton Business Improvement Area, Actons Farmers Market | Acton |
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 | Downtown Georgetown Business Improvement Area | Georgetown |
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 | Downtown Georgetown Business Improvement Area, Downtown Georgetown Farmers' Market | Georgetown |
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 | Downtown Milton Business Improvement Area | Milton |
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 | Downtown Oakville Business Improvement Area | Oakville |
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 | Downtown Oakville Business Improvement Area, TD Songs of Summer Series | Oakville |
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 | Dr. Bob Kemp Hospice, Centre for Hospice Palliative Care | Hamilton Mountain Central |
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| Dr. Bob Kemp Hospice, Camp Keaton | Hamilton |
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 | Dr. Bob Kemp Hospice, Day Hospice Program | Hamilton Mountain Central |
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 | Dr. Bob Kemp Hospice, Grief and Loss Supports | Hamilton Mountain Central |
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 | Dr. Bob Kemp Hospice, Volunteer Visiting Program | Hamilton Mountain Central |
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 | Dreams to Memories Foundation | Fort Erie |
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 | Drew Hildebrand Teen Benefit Fund | Mississauga |
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 | DriveAgain, Burlington, Driver Assessment Services | Burlington |
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 | DriveTest Centre, Burlington | Burlington |
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 | DriveTest Centre, Guelph | Guelph |
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 | Drivetest Centre, Oakville | Oakville |
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 | Drug Basics, Burlington - Fairview St, Pharmacy Services | Burlington |
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 | Drug Basics Pharmacy, Oakville, Pharmacy Services | Oakville |
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 | Drury Lane Theatrical Productions | Burlington |
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 | Dundas Neyagawa Medical Centre and Pharmacy | Oakville |
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 | Dundas Valley School of Art | Dundas |
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 | Dying with Dignity Canada | Toronto Downtown North |
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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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 | Dynes Christian Centre | Burlington |
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 | Dystonia Medical Research Foundation Canada | Toronto Downtown West |