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 | A Canadian Designated Drivers, Barrie - Mailing Address | Barrie |
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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 Badminton Club | 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 Gymnastics Club | New Tecumseth |
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 | Alliston Gymnastics Club, March Break Camp | New Tecumseth |
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 | Alliston Gymnastics Club, Summer Camp | 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 Men's Dart League | New Tecumseth |
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 | Alliston Minor Softball Association | 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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 | Alliston Tennis Club, G. A. Wright Athletic Field | 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, Care Partner Support Groups, Barrie | Barrie |
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 | Alzheimer Society of Simcoe County, Education Programs, Barrie | Barrie |
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 | Alzheimer Society of Simcoe County, Innisfil, Care Partner Support Group, Innisfil | Innisfil |
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 | Alzheimer Society of Simcoe County, Social/Recreational/Exercise Programs, Barrie | Barrie |
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 | Alzheimer Society of Simcoe County, Supportive Counselling, 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 - 41 Paris St | 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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 | Area Productions, Mailing Address, Arts and Crafts Shows | Barrie |
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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 |