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 | MacLaren Art Centre, Art Classes and Day Camps for Children and Youth | Barrie |
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 | MacLaren Art Centre | Barrie |
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 | MADD Canada, Mailing Address, Barrie Simcoe Chapter | Barrie |
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 | Make-A-Wish, Ontario Chapter | Pickering |
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 | Making Change, Mailing Address | Barrie |
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 | Manpower, Barrie | Barrie |
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 | March of Dimes Canada | Toronto |
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 | March of Dimes Canada, Barrie - Bryne Dr, Brain Injury Services - Outreach Activity Groups in Simcoe County | Barrie |
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 | March of Dimes Canada, Mailing Address - Orillia, Summer Recreation Program | Orillia |
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 | Marshall (Dr Peter) Psychologist | Barrie |
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 | Matthews House, Community and Residential Hospice, Community Support Services, Home Healthcare | New Tecumseth |
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 | May Court Club of Barrie | Barrie |
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 | May Court Club of Barrie, Barrie | Barrie |
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 | May Court Club of Barrie, Barrie, May Court Shop | Barrie |
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 | McArthur's Berry Farm, Oro Medonte | Oro-Medonte |
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 | Meals On Wheels, Alliston | New Tecumseth |
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 | Mediation Centre of Simcoe County | Barrie |
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 | Métis Nation of Ontario, Barrie Office, Infinity Property Services - Rural Urban Indigenous Housing Program | Barrie |
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 | Métis Nation of Ontario - Georgian Bay Council - Midland, Midland, Georgian Bay Metis Council - Community Support Services Program (CSS) | Midland |
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 | Metroland Media | Barrie |
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 | Midland Midwives By the Bay | Midland |
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 | Mom Concierge, Mailing address, Services for Birth, Breastfeeding, and Beyond! | Barrie |
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 | Mom's 4 Mom's Doula Services, No Physical Address | Oro-Medonte |
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 | Monarchist League Barrie Huronia Branch | Barrie |
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 | Mortgage Centre (The), Christmas Hamper Program | Collingwood |
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 | MS Canada | Toronto |
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 | MTM Conservation Association Incorporated, MTM Conservation Association, Tiny Marsh Provincial Wildlife Area | |
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 | MultiSport Canada | Barrie |
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 | Municipal Property Assessment Corporation, Barrie Assessment Office | Barrie |
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 | Museum on the Boyne | New Tecumseth |
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 | My Friend's House, Domestic Violence Shelter | Collingwood |
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 | My Sister's Place | New Tecumseth |