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| A Cappella Showcase | Waterdown |
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| A Child's Voice Foundation, Mississauga | Mississauga |
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| A+ Medical Centre and Walk-In | Milton |
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| Abilities to Work, Integrated Employment Services, Mississauga Location, Mississauga Location | Mississauga |
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| Abilities to Work, Mississauga Location, Employability Health Support Services (EHSS) | Mississauga |
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| Ability Online Support Network, Mono - Online Service | Mono |
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| AbleLiving Services, Burlington - Bethany Residence, Supportive Housing | Burlington |
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| AbleLiving Services, Burlington - Palmer Place, Supportive Housing | Burlington |
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| Aboriginal Legal Services | Toronto |
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| AboutFace | North York West |
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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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| Acclaim Health, Hospice Care and Bereavement Support | Oakville |
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| Achēv, Oakville, Newcomer Information Centre | Oakville |
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| Achēv, Language Assessment Centres, Mississauga Location | Mississauga |
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| Achēv, Accelerating Career Advancement Program | Mississauga |
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| Achēv, Newcomer Information Centre, Mississauga Location | Mississauga |
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| Achēv, Oakville, Language Assessment Centre | Oakville |
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| Acoustic Neuroma Association of Canada | Toronto |
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| Action Canada for Sexual Health and Rights | Ottawa |
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| Active Aldershot Society | Burlington |
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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 Citizens Band | Acton |
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| Acton Curling Club | Acton |
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| Acton Foodshare, Food Bank | Acton |
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| Acton Medical and Urgent Care | Acton |
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| Acton Skating Club | Acton |
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| Acton Soccer Club | Acton |
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| Acton-Halton Walk-in Clinic | Halton Hills |
|
| ADAPT Halton, Oakville - Head Office, Alcohol, Drug and Gambling Assessment, Prevention and Treatment Services | Oakville |
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| ADAPT Halton, Burlington Office | Burlington |
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| ADAPT Halton, Community Justice Programs | Halton Region |
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| ADAPT Halton, Community Withdrawal Management Services | Halton Region |
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| ADAPT Halton, Concurrent Disorders Programs | Halton Region |
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| ADAPT Halton, Georgetown Office | Georgetown |
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| ADAPT Halton, Milton Office | Milton |
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| ADAPT Halton, Problem Gambling & Behavioural Addictions Services | Halton Region |
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| ADAPT Halton, Youth Programs | Halton Region |
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| Adaptive Clothing, Halton Region | Ontario |
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| Addiction Services Central Ontario, Remote Single Session Counselling | Aurora |
|
| Adult Learning Centre, Georgetown - Head Office, Essential Skills for Employment | Georgetown |
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| Adult Learning Centre, Acton - Halton Hills Public Library | Acton |
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| Adult Learning Centre, Burlington - Centre for Skills Development | Burlington |
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| Adult Learning Centre, Literacy and Basic Skills | Halton Region |
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| Adult Learning Centre, Milton - Centre for Skills Development | Milton |
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| Adult Learning Centre, Oakville - Centre for Skills Development | Oakville |
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| Adults in Motion, Day Program | Oakville |
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| Afghan Association of Ontario, Toronto | Toronto |
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| African Community Services of Peel, Family Program | Brampton |
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| African Community Services of Peel, Newcomer Settlement Program | Brampton |
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| African Community Services of Peel, Violence Against Women Program | Brampton |
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| AgScape | Milton |
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| Akwaba Cultural Exchange, Cultural Heritage Group | Milton |
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| Al-Anon Family Groups, Halton Hills and Milton, Al-Anon and Alateen Meetings | Halton Hills |
|
| Al-Anon Family Groups, Hamilton / Burlington, Al-Anon / Alateen Meetings | Burlington |
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| Al-Anon Family Groups, Oakville, Al-Anon / Alateen Meetings | Oakville |
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| Alcoholics Anonymous, Oakville - Halton District Office, Halton Area Meetings | Halton Region |
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| Alcoholics Anonymous, North Halton / Erin District, Erin and Area Meetings | Erin |
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| Alcoholics Anonymous (GTA), Find an Alcoholics Anonymous Meeting - Greater Toronto Area Intergroup | Ontario |
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| Alcoholics Anonymous Hamilton, Alcoholics Anonymous Meetings | |
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| Aldershot Lions Club | Burlington |
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| Aldershot Tennis Club | Burlington |
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| Alliance for South Asian AIDS Prevention, Toronto | Toronto |
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| Alpha Care Medical Center | Halton Hills |
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| Anglican Church of the Incarnation | Oakville |
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| Anonymous Friend, Youth Peer to Peer Mental Health Support | Oakville |
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| Aplastic Anemia and Myelodysplasia Association of Canada, Brighton | Brighton (Municipality of) |
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| Appleby College | Oakville |
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| Appleby College, Appleby Academy | 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 - 79 Main St, Licensed Child Care Centre | Georgetown |
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| ARCH Disability Law Centre | Toronto |
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| Armagh, Transitional Housing, Armagh House | Mississauga |
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| Armenian Family Support Services | Toronto |
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| Art Gallery of Burlington | Burlington |
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| ArtHouse for Children and Youth | Halton Region |
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| ARTSHINE Inc. / Arts4All | Kitchener |
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| Asian Community AIDS Services, Toronto | Toronto |
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| Asperger's Society of Ontario | Toronto Downtown North |
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| Assaulted Women's Helpline | Toronto |
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| Associated Youth Services of Peel, Mississauga | Mississauga |
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| Association of Ontario Midwives | Toronto Downtown Central |
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| Asthma Canada | Toronto Downtown North |
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| Atwell Centre, Oakville, Pregnancy Support Services | Oakville |
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| Aura Freedom International | Toronto |
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| Autism Ontario, Halton Chapter - Mailing Address | Burlington |
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| Autism Ontario | Toronto Downtown West |
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| Average Joe Sports Club, Co-ed Recreational Sports Leagues | Oakville |