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 | A&A Piano/Violin Performance and Instruction, Barrie | 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 | Toronto |
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 | Addiction Services Central Ontario, South Simcoe Community RAAM - 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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 | Advocacy Centre for the Elderly | Toronto |
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 | Agilec, Innisfil, Integrated 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 | 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 Business Improvement Association | 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's Attic Thrift Store, Alliston - 39 Victoria St W | New Tecumseth |
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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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 | Angus and District Lions Club, No Physical Address | Essa |
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 | Angus Cooperative Homes | Essa |
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 | Angus Food Bank | Angus |
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 | ARCH Disability Law Centre | Toronto |
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 | Ask4Care Support Services, Barrie | Barrie |
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 | Aspire Community & Developmental Services | Barrie |
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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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 | Autism Ontario [Central East] | Toronto |
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 | Automobile Protection Association | Toronto |