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 | A Cappella Showcase | Milton |
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 | A Child's Voice Foundation | Mississauga |
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 | Ability Online Support Network | Mono |
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 | Access Midwives, Midwifery Services | Hamilton |
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 | AccessOAP | Toronto |
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 | Acclaim Health, Home Care | Oakville |
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 | Active Aldershot Society | Burlington |
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 | Active Chefs | Halton Region |
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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 | Halton Hills |
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 | Acton Soccer Club | Acton |
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 | Acton's Early Learning & Child Care Centre, Licensed Child Care Centre | Acton |
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 | Adoption Council of Ontario | Toronto |
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 | African Community Services of Peel, Violence Against Women Program | Brampton |
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 | Aiza's Teddybear Foundation | Oakville |
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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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 | Angus Valley Montessori, Licensed Child Care Centre | Milton |
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 | Anonymous Friend, Online/Web Service, Youth Mental Health Support | Oakville |
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 | Appleby College, Oakville, March Break Camps | Oakville |
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 | Appleby College, Oakville, Summer Camp Programs | Oakville |
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 | Appleby Tennis Club | Burlington |
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 | Apples and Angels Montessori School and Day Care, Licensed Child Care Centre | Georgetown |
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 | Apples and Angels Montessori School and Day Care, Georgetown, Licensed Child Care Centre | Georgetown |
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 | Art as Therapy, Psychotherapy and Art Therapy | Milton |
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 | ArtHouse for Children and Youth | Halton Region |
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 | Ashwood Glen School, Licensed Child Care Centre | Burlington |
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| Asperger's Society of Ontario | Toronto Downtown North |
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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 Job Club | Burlington |
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 | Autism Ontario, Halton Chapter - Mailing Address | Burlington |
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 | Autism Ontario | Toronto Downtown West |