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 | A Cappella Showcase | Waterdown |
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 | A Child's Voice Foundation, Mississauga | Mississauga |
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 | Ability Online Support Network, Mono - Online Service | Mono |
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 | Access Midwives, Midwifery Services | Hamilton |
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 | AccessOAP | Toronto |
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 | Active Aldershot Society | Burlington |
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 | Active Chefs | Oakville |
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 | Acton Aqua Ducks Swim Club | Acton |
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 | Acton Badminton Club, Recreational Badminton | Acton |
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 | Acton Curling Club | Acton |
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 | Acton Foodshare, Food Bank | Acton |
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 | Acton Skating Club | Acton |
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 | Acton Soccer Club | Acton |
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 | Adoption Council of Ontario | Toronto |
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 | African Community Services of Peel, Brampton, Violence Against Women Program | Brampton |
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 | Aldershot Tennis Club | Burlington |
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 | Alpha's Discovery Kids Preschool and Daycare, Licensed Child Care Centre | Oakville |
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 | Alton Kids Child Care Center, Licensed Child Care Centre | Burlington |
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 | Anglican Church of the Incarnation | Oakville |
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 | Angus Valley Montessori, Licensed Child Care Centre | Milton |
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 | Anonymous Friend, Youth Peer to Peer Mental Health Support | Oakville |
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 | Appleby College, March Break Camps | Oakville |
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 | Appleby College, Newcomers Tutoring Program | Oakville |
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 | Appleby College, Summer Camp Programs | Oakville |
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 | Appleby Tennis Club | Burlington |
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 | Apples and Angels Montessori School and Day Care, Georgetown - 83 Main St, Licensed Child Care Centre | Georgetown |
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 | Apples and Angels Montessori School and Day Care, Georgetown - 79 Main St, Licensed Child Care Centre | Georgetown |
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 | ArtHouse for Children and Youth | Oakville |
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 | Arubah Kids Clinic | Mississauga |
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 | Ashwood Glen School, Licensed Child Care Centre | Burlington |
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 | Association for Bright Children of Ontario, Halton Chapter | Halton Region |
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 | Association of Ontario Midwives | Toronto Downtown Central |
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 | Ausum Charity for Autism | Streetsville |
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 | Autism Ontario, Halton Chapter - Mailing Address | Burlington |
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 | Autism Ontario | Toronto Downtown West |