| Organization Name(s) | Located In |
| Y's Men's Club Midland | Midland |
| Yeates [Dr Gillian], O'toole [Dr Susan] | Collingwood |
| Yeung [Dr W], Milos [Dr A] | Orillia |
| YMCA Geneva Park Leadership Development, Camping, Education, and Conference Services | Ramara |
| YMCA of Simcoe/Muskoka, Barrie, Youth Services | Barrie |
| YMCA of Simcoe/Muskoka, Barrie, Youth Services, Community Outreach | Barrie |
| YMCA of Simcoe/Muskoka, Barrie, Youth Services, Counselling and Support Services | Barrie |
| YMCA of Simcoe/Muskoka, Barrie, Youth Services, Youth Employment Centre | Barrie |
| YMCA of Simcoe/Muskoka, Camp Kitchikewana | Georgian Bay Township |
| YMCA of Simcoe/Muskoka, Child Care Centre. Alliston, Ernest Cumberland Elementary School Location | Alliston |
| YMCA of Simcoe/Muskoka, Child Care Centre. Alliston, Holy Family Elementary School Location | Alliston |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Ferndale Woods Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Georgian College Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Grove St Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Mapleview Dr Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Monsignor Clair Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, Oakely Park Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, St Gabriel the Archangel Elementary School | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie, St. Nicholas Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Barrie., Sister Catherine Donnelly Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Centre. Bracebridge, Muskoka Falls Elementary School Location | Bracebridge |
| YMCA of Simcoe/Muskoka, Child Care Centre. Collingwood, Admiral Collingwood Elementary School Location | Collingwood |
| YMCA of Simcoe/Muskoka, Child Care Centre. Collingwood, Jean Vanier High School Location | Collingwood |
| YMCA of Simcoe/Muskoka, Child Care Centre. Huntsville, Deerhurst Resort Location | Huntsville |
| YMCA of Simcoe/Muskoka, Child Care Centre. Innisfil, Goodfellow Elementary School Location | Innisfil |
| YMCA of Simcoe/Muskoka, Child Care Centre. Innisfil, St. Francis of Assisi Elementary School Location | Innisfil |
| YMCA of Simcoe/Muskoka, Child Care Centre. Midland, Midland Secondary School Location | Midland |
| YMCA of Simcoe/Muskoka, Child Care Centre. Midland., Little Lake Park Rd Location | Midland |
| YMCA of Simcoe/Muskoka, Child Care Centre. Midland., Mundy's Bay Elementary School Location | Midland |
| YMCA of Simcoe/Muskoka, Child Care Centre. Minesing, Minesing Central Elementary School Location | Minesing |
| YMCA of Simcoe/Muskoka, Child Care Centre. Orillia, Harriett Todd Elementary School Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Centre. Orillia, Jarvis St Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Centre. Orillia, Notre Dame Elementary School Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Centre. Orillia, Park St Collegiate Secondary School Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Centre. Orillia, Regent Park Elementary School | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Centre. Penetanguishene, St Ann's Elementary School Location | Penetanguishene |
| YMCA of Simcoe/Muskoka, Child Care Centre. Tottenham, Tottenham Elementary School Location | Tottenham |
| YMCA of Simcoe/Muskoka, Child Care Centre. Wasaga Beach, Birchview Dunes Elementary School Location | Wasaga Beach |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Alliston, 8th Ave Youth Centre Location | Alliston |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Barrie, Allandale Heights Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Barrie, Codrington Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Barrie, Mapleview Heights Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Barrie, Terry Fox Elementary School Location | Barrie |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Bradford, Honourable Earl Rowe Elementary School Location | Bradford |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Collingwood, Cameron Street Elementary School Location | Collingwood |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Collingwood, Connaught Elementary School Location | Collingwood |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Collingwood, Mountain View Elementary School Location | Collingwood |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Elmvale, Huronia Centennial Elementary School Location | Elmvale |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Midhurst, Forest Hill Elementary School Location | Midhurst |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Midland, Bayview Elementary School Location | Midland |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Nottawa, Nottawa Elementary School Location | Clearview |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Orillia, Marchmont Elementary School Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Orillia, Peter St Location | Orillia |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Victoria Harbour, Victoria Harbour Elementary School Location | Victoria Harbour |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Wasaga Beach, Mosley St. Location | Wasaga Beach |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children. Washago, Rama Central Elementary School Location | Severn |
| YMCA of Simcoe/Muskoka, Child Care Program for School Age Children.Beeton, Tecumseh Beeton Elementary School Location | Beeton |
| YMCA of Simcoe/Muskoka, Newcomer Services | Barrie |
| YMCA of Simcoe/Muskoka, Newcomer Services, Immigrant Settlement and Adaptation Program | Barrie |
| YMCA of Simcoe/Muskoka, Newcomer Services, LINC Program | Barrie |
| YMCA of Simcoe/Muskoka, Newcomer Services, Newcomer Settlement Program | Barrie |
| YMCA of Simcoe/Muskoka, Ontario Employment Services, Midland | Midland |
| YMCA of Simcoe/Muskoka. Association Office | Barrie |
| YMCA of Simcoe/Muskoka. Barrie | Barrie |
| YMCA of Simcoe/Muskoka. Barrie, Day Camps | Barrie |
| YMCA of Simcoe/Muskoka. Barrie, Health Star | Barrie |
| YMCA of Simcoe/Muskoka. Barrie, Youth Services, Youth Gambling Awareness Program | Barrie |
| YMCA of Simcoe/Muskoka. Collingwood | Collingwood |
| YMCA of Simcoe/Muskoka. Innisfil | Innisfil |
| YMCA of Simcoe/Muskoka. Midland | Midland |
| YMCA of Simcoe/Muskoka. Midland, Day Camps | Midland |
| YMCA of Simcoe/Muskoka. Orillia | Orillia |
| YMCA of Simcoe/Muskoka. Wasaga Beach | Wasaga Beach |
| Yoga By the Bay | Barrie |
| Yoga for Everyone | Barrie |
| Yoga Hall | Barrie |
| Yoga Meditation Therapy Centre | Orillia |
| Yogastock | Midland |
| York Chamber Ensemble | York Region |
| York Medical Walk In Clinics | Newmarket |
| York Professional Care & Education, Children's Academy [The] | Barrie |
| York Professional Care & Education, Home Based Child Care | Barrie |
| York Region Abuse Program | Newmarket |
| York Simcoe Express AAA Hockey Association Inc | Newmarket |
| York-Simcoe Brain Injury Services, Barrie Office | Barrie |
| Young [Dr Jennifer] | Collingwood |
| Young Parent Resource Room | Collingwood |
| Your Way Counselling and Consulting Services | Collingwood |
| Youth Haven (Barrie) | Barrie |
| Youth Leadership Camps Canada | Orillia |
| YWCA Toronto, Pre-Apprenticeship Carpentry Training Program for Women | Toronto |
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