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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, Barrie - Bryne Dr, Brain Injury Services - Outreach Activity Groups in Simcoe County | Barrie |
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| March of Dimes Canada (GTA) | Toronto |
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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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| Metroland Media | Barrie |
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| Midland Midwives By the Bay | Midland |
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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 | |
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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, Tiny Marsh Nature Centre, Tiny Marsh Provincial Wildlife Area | Tiny |
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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 |