| Organization Name(s) | Located In |
| M M Kelly Counselling and Adoption Agency | Barrie |
| Mackenzie Place Long Term Care | Newmarket |
| MacLaren Art Centre, Day Camps and Art Programs for Children and Youth | Barrie |
| Mad River Ganaraska Trail Club | Simcoe County |
| MADD Canada, Barrie Simcoe Chapter | Barrie |
| MADD Canada. National Office | Oakville |
| Magee (Dr Rick) | Innisfil |
| Malton Community Information Service | Malton |
| Manpower | Barrie |
| Mansfield Minor Baseball Association | Mansfield |
| Mansfield Outdoor Centre | Mansfield |
| Mansfield Outdoor Centre, Mulmur Hills Camp | Mansfield |
| Manulife Financial | Toronto |
| March of Dimes Canada, Summer Holiday Program | Barrie |
| March of Dimes Canada (London), Home and Vehicle Modification Program | London |
| Marie of the Incarnation School | Bradford |
| Marshall (Dr Peter) Psychologist | Barrie |
| Martin Luther Court | Barrie |
| Mary McGill Community Mental Health Program | Alliston |
| Masonic Lodge, Cookstown Manitoba Lodge 236 | Cookstown |
| Masonic Lodge, Tottenham Lodge 467 | Tottenham |
| Matthews House Hospice | Alliston |
| Matthews House Hospice, Client Support, Family and Caregiver Support, Bereavement Support | Alliston |
| May Court Club of Barrie (The) | Barrie |
| McArthur's Berry Farm | Oro-Medonte |
| McKechnie Counselling Services | Newmarket |
| Meadowbrook Campgrounds | Alliston |
| Meals On Wheels, Alliston | Alliston |
| Meals on Wheels, Angus | Barrie |
| Meals On Wheels, Innisfil | Innisfil |
| Mediation Centre of Simcoe County Inc | Barrie |
| Medichair Barrie | Barrie |
| Medigas | Barrie |
| Mental Health and Addiction Services of Simcoe County, Barrie Office | Barrie |
| Mental Health and Addiction Services of Simcoe County, CARAH House Crisis Services, Mental Health Crisis Line | Barrie |
| Mental Health and Addiction Services of Simcoe County, CARAH House Crisis Services, Residential Crisis Beds | Barrie |
| Mental Health and Addiction Services of Simcoe County, Case Management | Barrie |
| Mental Health and Addiction Services of Simcoe County, Community Awareness Program | Barrie |
| Mental Health and Addiction Services of Simcoe County, Housing Support | Barrie |
| Mental Health and Addiction Services of Simcoe County, Human Services Justice System Program | Barrie |
| Mental Health and Addiction Services of Simcoe County, RSVP Clubhouse | Barrie |
| Mental Health and Addiction Services of Simcoe County, South Simcoe Satellite Office | Alliston |
| Mental Health and Addiction Services of Simcoe County, The Volunteer Program | Barrie |
| Mental Health Consumer Survivor Project for Simcoe County | Collingwood |
| Mental Health Consumer Survivor Project for Simcoe County, People Supporting People | Collingwood |
| Midwives Nottawasaga | Collingwood |
| Mikey's Place for Autism Resource Centre | Midland |
| Ministry of Children and Youth Services, Ontario, United Way of Greater Simcoe County, Eat Well to Excel. Simcoe County | Simcoe County |
| Ministry of Community Safety and Correctional Services, Ontario Fire Marshall - Southwest Region | Midhurst |
| Ministry of Economic Development and Innovation, Simcoe Muskoka Office | Midhurst |
| Miss Jennie's Performing Arts Studio | Innisfil |
| Mnjikaning Kendaaswin School Age Program | Rama |
| Molson Sportsmen Hockey League | Barrie |
| MommyWorld.net | New Tecumseth |
| Monarchist League of Canada (The) | Oakville |
| Monsignor J E Ronan Catholic School | Beeton |
| Montessori Country School (The) | Nobleton |
| Mood Disorders Support Group of Barrie | Barrie |
| Moreau (Dr Monique) | Alliston |
| Mortgage Centre (The), Collingwood Location, Christmas Hamper Program | Collingwood |
| MotherCare Barrie | Barrie |
| MotherCare Barrie Next Step Program | Barrie |
| MotherCare Innisfil | Innisfil |
| MotherCare Innisfil Next Step Program | Innisfil |
| Mothercare North Simcoe, Community Action Program for Children / Canada Prenatal Nutrition Program, Catulpa Community Support Services Inc. | Midland |
| Motherisk, Info Line and Clinic | Toronto |
| Motion Specialties, Barrie Location | Barrie |
| MTM Conservation Association Incorporated, Tiny Marsh Provincial Wildlife Area, Marl Lake, Matchedash Bay | Tiny |
| Multiple Sclerosis Society of Canada, Simcoe County Chapter | Barrie |
| Multiple Sclerosis Society of Canada, Simcoe County Chapter, Alliston Self Help/Exercise Group | Alliston |
| Municipal Property Assessment Corporation, Simcoe County, Municipal Assessment Office #16, Property Assessment Program | Barrie |
| Murphy's Farmstead | Alliston |
| Muscular Dystrophy Canada, Ontario Region | Toronto |
| Muscular Dystrophy Canada, Simcoe Region Chapter of Muscular Dystrophy | Simcoe County |
| Music For Young Children, Orillia | Orillia |
| My Friend's House | Collingwood |
| My Friend's House, Community Outreach / Transition Program | Collingwood |
| My Friend's House, Next Door Transitional Support Program | Collingwood |
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