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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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 | Making Change, No Physical 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, Brain Injury Services - Outreach Activity Groups in Simcoe County | Barrie |
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 | March of Dimes Canada, Mailing Address, 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 | Alliston |
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 | May Court Club of Barrie | Barrie |
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 | May Court Club of 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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 | Medigas, Barrie | Barrie |
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 | Métis Nation of Ontario, Barrie Office, Infinity Property Services - Rural and Native Housing Program | Barrie |
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 | Métis Nation of Ontario, Midland, Georgian Bay Metis Council - Community Support Services | Midland |
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 | Midwives Nottawasaga | Collingwood |
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 | Midwives Nottawasaga | Collingwood |
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 | Mikey's Place for Autism Resource Centre, No Physical address | Midland |
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 | Ministry of Heritage, Sport, Tourism and Culture Industries, Central Region - Midhurst Office, Grants Administration and Community Development | Midhurst |
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 | Molson Sportsmen Hockey League | Barrie |
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 | Mom Concierge, Mountain Momma Collective, 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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 | Motion, Barrie | Barrie |
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 | MS Society of Canada, Ontario & Nunavut Division | Barrie |
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 | MS Society of Canada, Ontario & Nunavut Division, Alliston, Support/Exercise Group | Alliston |
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 | MTM Conservation Association Incorporated, MTM Conservation Association, 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 Doctor Now, No physical location | Ontario |
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 | My Friend's House, Domestic Violence Shelter | Collingwood |
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 | My Sister's Place | New Tecumseth |
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 | MyMobility Home Health Care | Barrie |