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 | Rapid Addiction Treatment Centre, Medical Treatment and Counselling for Addictions | Oakville |
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 | Ray Pharmacy, Pharmacy Services | Oakville |
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 | Rebecca Medical Walk In Clinic, Walk-in Medical Clinic | Oakville |
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 | Redhill Church | Milton |
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 | Redleaf Cultural Integration, Burlington Chinese Community Connection | Burlington |
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 | Region of Halton Dart League | Georgetown |
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 | Rehoboth Canadian Reformed Church of Burlington-Waterdown | Burlington |
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 | Re-Imagine Ontario, Oakville, Community Support Services for Children, Youth and Seniors | Oakville |
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 | Remedy's Rx Aldershot Village Pharmacy, Pharmacy Services | Burlington |
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 | Remedy's Rx Progressive Pharmacy, Pharmacy Services | Burlington |
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 | Remedy'sRx Pharmacy, Oakville - Lakeshore Rd E (Madill Health-Aid Pharmacy), Pharmacy Services | Oakville |
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 | Remembrance Day Ceremonies, Burlington | Burlington |
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 | Renascent, Wright Centre | Toronto |
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 | Retired Teachers of Ontario, Halton District 15 - No Physical Address | Halton Region |
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 | Retired Women Teachers of Ontario, Burlington, BurlOak Branch | Burlington |
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| Retired Women Teachers of Ontario / Organisation des enseignantes retraitees de l'Ontario, No Physical Address, Lydia Snow North Halton Branch | Halton North |
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 | Retirement Homes Regulatory Authority | Toronto Downtown Central |
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 | Retreads Motorcycle Club International, Ontario South Chapter - Mailing Address, Social Club for Motorcyclists and Enthusiasts | Halton Region |
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 | Revera Retirement Living, Burlington - Appleby Place, Retirement Home | Burlington |
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 | Revera Retirement Living, Burlington - The Williamsburg, Retirement Home | Burlington |
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 | Revera Retirement Living, Milton - Birkdale Place, Retirement Home | Milton |
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 | Revera Retirement Living, Oakville - Kensington (The), Retirement Home | Oakville |
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 | Revera Retirement Living, Oakville - Churchill Place, Retirement Home | Oakville |
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 | Revera Retirement Living, Oakville - Trafalgar Lodge, Retirement Home | Oakville |
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 | Rexall Pharma Plus, Burlington - Brant St, Pharmacy Services | Burlington |
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 | Rexall Pharma Plus, Burlington - Guelph Line, Pharmacy Services | Burlington |
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 | Rexall Pharma Plus, Burlington - New St, Pharmacy Services | Burlington |
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 | Rexall Pharmacy, Acton - Queen St E, Pharmacy Services | Halton Hills |
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 | Rexall Pharmacy, Milton - Derry Rd W, Pharmacy Services | Milton |
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 | Rexall Pharmacy, Oakville - Lakeshore Rd W, Pharmacy Services | Oakville |
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 | Rexall Pharmacy, Oakville - Maple Grove Rd, Pharmacy Services | Oakville |
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 | Richard III Society of Canada | Burlington |
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 | Right at Home Canada, Burlington-Milton, In Home Care Services | Burlington |
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 | Right at Home Canada, Oakville, In Home Care Services | Oakville |
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 | River Glen Pharmacy, Pharmacy Services | Oakville |
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 | River Oaks Community Church | Oakville |
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 | River Oaks Medical Pharmacy, Pharmacy Services | Oakville |
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 | ROCK, Burlington ROCK Hub - Burloak, Our Community Cares - Food Pantry | Burlington |
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 | ROCK, Burlington ROCK Hub - Warwick, Our Community Cares - Food Pantry | Burlington |
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 | Roedean Cooperative Homes, John Scott Building | Oakville |
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 | Rogers Connected for Success | Toronto |
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 | Routes Adventures | Kingston |
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 | Royal Botanical Gardens | Burlington |
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 | Royal Botanical Gardens, Gardening Information Service | Burlington |
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 | Royal Botanical Gardens, Volunteer Program | Burlington |
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 | Royal Canadian Legion, Acton - Branch 197 | Acton |
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 | Royal Canadian Legion, Georgetown - Branch 120 | Georgetown |
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 | Royal Canadian Legion, Burlington - Branch 60 | Burlington |
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 | Royal Canadian Legion, Milton - Branch 136 | Milton |
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 | Royal Canadian Legion, Oakville - Branch 114 | Oakville |
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 | Royal Canadian Legion, Oakville - Bronte Branch 486 | Oakville |
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 | Royal Canadian Legion, Acton - Branch 197, Ladies Auxiliary | Acton |
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 | Royal Canadian Legion, Burlington - Branch 60, Ladies Auxiliary | Burlington |
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 | Royal Canadian Legion, Georgetown - Branch 120, Ladies Auxiliary | Georgetown |
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 | Royal Canadian Naval Benevolent Fund | Ottawa |
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 | Royal Oak Clinic Family Practice and Walk-In | Oakville |
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 | Royal Scottish Country Dance Society, Burlington (Ontario) Branch - Mailing Address | Burlington |
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 | Rural Ottawa South Support Services, Telephone Service for Seniors (55+), A Friendly Voice | Ottawa |