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| Abilities In Motion | New Tecumseth |
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| Achill Choral Society, Caledon | Caledon (Town of) |
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| Ad Standards | Toronto |
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| Addiction Services Central Ontario, Stevenson Memorial Hospital - Alliston, Rapid Access Addiction Medicine Clinic, South Simcoe | New Tecumseth |
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| Adjala-Tosorontio, Township of, Municipal Office | New Tecumseth |
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| Adjala-Tosorontio, Township of, No physical address, Rest Stations for Extreme Weather Relief | Adjala-Tosorontio |
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| Adjala-Tosorontio. Fire Service | New Tecumseth |
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| Adoption Council of Ontario | Toronto |
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| After the Curb, No Physical Address | Barrie |
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| Agilec, Innisfil, Ontario Employment Services | Innisfil |
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| Al-Anon, Angus / Borden, District 1 - Love and Hope Group | Adjala-Tosorontio |
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| Al-Anon, Bradford, District 18 - Journey to Freedom Group | Bradford West Gwillimbury |
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| Al-Anon / Alateen, Barrie - No Physical Address | Barrie |
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| Alcohol and Gaming Commission of Ontario, Head Office | Toronto |
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| Alcoholics Anonymous, Barrie, Barrie and Area Intergroup | Barrie |
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| Alcoholics Anonymous South Simcoe, Alliston, Alcoholics Anonymous | New Tecumseth |
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| Alcoholics Anonymous South Simcoe, Borden CFB, Alcoholics Anonymous | Adjala-Tosorontio |
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| Alcoholics Anonymous South Simcoe, Bradford, Alcoholics Anonymous | Bradford West Gwillimbury |
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| Alcoholics Anonymous South Simcoe, Innisfil - Alcona, Alcoholics Anonymous | Innisfil |
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| Alcoholics Anonymous South Simcoe, Innisfil - Stroud, Alcoholics Anonymous | Innisfil |
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| Alcoholics Anonymous South Simcoe, Tottenham, Alcoholics Anonymous | New Tecumseth |
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| Alectra | Vaughan |
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| Alert Ready - Emergency Alert System | Ontario |
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| All Saints' Anglican Church. Collingwood | Collingwood |
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| Alliston & District Humane Society | Adjala-Tosorontio |
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| Alliston Alliance Church | New Tecumseth |
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| Alliston and District Mens Masters Slo Pitch League | New Tecumseth |
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| Alliston Chiropractic Wellness Centre | New Tecumseth |
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| Alliston Community Christian School, Alliston - 39 Victoria St W, Alliston's Attic Thrift Store | New Tecumseth |
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| Alliston Community Christian School | New Tecumseth |
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| Alliston Dental Hygiene Clinic | New Tecumseth |
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| Alliston Diagnostic Centre, Alliston, Medical Diagnostic Imaging and Consultation | New Tecumseth |
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| Alliston Family Health Team | New Tecumseth |
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| Alliston Food Bank, Alliston | New Tecumseth |
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| Alliston Lions Club, Alliston Lions Christmas Food and Toy Hampers | New Tecumseth |
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| Alliston Lions Club | New Tecumseth |
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| Alliston Lions Club, Loan Cupboard | New Tecumseth |
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| Alliston Pentecostal Church | New Tecumseth |
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| Alliston Physiotherapy and Sports Rehabilitation Clinic | New Tecumseth |
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| ALS Canada | Hastings County |
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| ALS Canada, Mailing Address, ALS Canada Community Services | Barrie |
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| Alzheimer Society of Simcoe County, Barrie | Barrie |
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| Alzheimer Society of Simcoe County, Barrie, Education Programs | Barrie |
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| Alzheimer Society of Simcoe County, Barrie, Social/Recreational/Exercise Programs | Barrie |
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| Alzheimer Society of Simcoe County, Barrie, Supportive Counselling | Barrie |
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| Alzheimer Society of Simcoe County, Care Partner Support Groups, Barrie | Barrie |
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| Am Shalom Synagogue | Barrie |
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| Amnesty International, Barrie - No Physical Address, Barrie Amnesty International Action Circle | Barrie |
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| Anchor Point Church, Alliston - 19 Victoria St E | New Tecumseth |
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| Angus and District Lions Club | Essa |
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| Angus Cooperative Homes | Essa |
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| Angus Food Bank | Angus |
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| Angus Horticultural Society | Essa |
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| ARCH Disability Law Centre | Toronto |
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| Ask4Care Support Services, Barrie | Barrie |
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| Asperger's Society of Ontario | Toronto Downtown North |
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| Aspire Community & Developmental Services | |
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| Assaulted Women's Helpline | Toronto |
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| Association of Administrative Professionals, Barrie / Simcoe County Branch | Barrie |
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| Association of Ontario Doulas, No Physical Address | Toronto |
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| Association of Parent Support Groups in Ontario | Aurora |
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| Asthma Society of Canada | Toronto Downtown |
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| Autism Ontario [Central East] | Toronto |
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| Automobile Protection Association | Toronto |
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| AWARE Simcoe | Simcoe County |