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| Oakdale Child and Family Services, Oakdale Child and Family Service | Springwater |
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| OCD North | Barrie |
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| OCD Wellness | Barrie |
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| Ogemawahj Tribal Council, Ogemawahj Tribal Training and Economic Resources, Rama - 5984 Rama Rd | Chippewas of Rama First Nation |
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| Ombudsman Ontario | Toronto |
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| Ombudsman Ontario | |
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| Once Upon a Child | Barrie |
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| One Roof, Midland | Midland |
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| Ontario Aboriginal Housing Services | Sault Ste. Marie |
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| Ontario Association of Optometrists, Eye See...Eye Learn | Toronto Downtown Central |
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| Ontario Clean Water Agency, Georgian Bay Highlands Plant | Springwater |
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| Ontario College of Trades | Toronto Downtown |
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| Ontario Dental Association | Toronto Downtown North |
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| Ontario Energy Board, Ontario Electricity Support Program (OESP) | Ontario |
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| Ontario Energy Board (Central East) | Toronto |
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| Ontario Energy Board (Central East), Central East Ontario - No Physical Address, Low-Income Energy Assistance Program (LEAP) - Central East Application Sites | Toronto |
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| Ontario English Catholic Teachers Association. Simcoe Muskoka Unit | Barrie |
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| Ontario Federation of Snowmobile Clubs, Mailing Address | Barrie |
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| Ontario Federation of Snowmobile Clubs, Simcoe County, Mid Ontario Snowmobile Trails | Tay |
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| Ontario Genealogical Society, Simcoe County Branch - Mailing Address | Barrie |
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| Ontario Health - Trillium Gift of Life Network | Toronto Downtown Central |
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| Ontario Health atHome, Barrie - Huronia Rd, Community Nursing Clinic | Barrie |
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| Ontario Health atHome, Barrie - Sperling Dr | Barrie |
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| Ontario Health atHome, Barrie - Sperling Dr, Telehomecare | Barrie |
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| Ontario Health atHome, nsmhealthline.ca | Barrie |
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| Ontario Hooking Craft Guild, Mailing Address | Minesing |
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| Ontario Human Rights Commission, 180 Dundas St W | Toronto Downtown |
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| Ontario Medical Imaging, Midland | Midland |
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| Ontario Ministry of Natural Resources and Forestry, Ontario Hunter Education Program | Peterborough |
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| Ontario Motor Vehicle Industry Council, Toronto | Toronto |
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| Ontario Nature | Toronto Downtown |
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| Ontario Parole Board, Victim Support | Toronto |
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| Ontario Photo Card | Ontario |
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| Ontario Poison Centre | Toronto Downtown Central |
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| Ontario Provincial Police, Midland - Hwy 12, Southern Georgian Bay Detachment | Midland |
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| Ontario Provincial Police, OPP Satellite Office - Penetanguishene, Penetanguishene Satellite Office | Penetanguishene |
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| Ontario Provincial Police, Orillia - Memorial, General Headquarters | Orillia |
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| Ontario Provincial Police, Southern Georgian Bay Detachment - Midland Office, Southern Georgian Bay Detachment - Meeting Facilities | Midland |
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| Ontario Provincial Police, Southern Georgian Bay Detachment, Midland - Second St | Midland |
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| Ontario Provincial Police, Wasaga Beach, Huronia West Detachment | Wasaga Beach |
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| Ontario Registered Music Teachers Association, Barrie Branch, No Physical Address | Barrie |
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| Ontario Secondary School Teachers' Federation, Barrie, Simcoe County District 17 | Barrie |
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| Ontario Senior Games Association | Barrie |
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| Ontario Society for the Prevention of Cruelty to Animals, Orillia | Orillia |
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| Ontario SPCA and Humane Society, Barrie - 91 Patterson Rd, Ontario SPCA - Barrie Animal Centre | Barrie |
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| Ontario SPCA and Humane Society, Barrie - 91A Patterson Rd, Marion Vernon Memorial Animal Clinic | Barrie |
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| Ontario SPCA Midland & District Animal Centre, Provincial Animal Transfer Hub, Carver Off-Leash Dog Park | Tay |
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| Ontario SPCA Midland & District Animal Centre, Provincial Animal Transfer Hub, Community Support Services - Animal Centre and Adoption | Tay |
|
| Ontario SPCA Midland & District Animal Centre, Provincial Animal Transfer Hub, Feline Spay/Neuter Surgeries | Tay |
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| Ontario Track3 Adaptive Sports Association | Toronto |
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| Ontario Trails Council | Deseronto |
|
| Ontario Vipassana Centre, Egbert, Dhamma Torana | |
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| Ontario Water Centre (The) | Georgina |
|
| Ontario, Ministry of the Solicitor General, Barrie, Probation and Parole Services, Barrie | Barrie |
|
| Ontario, Ministry of the Solicitor General, Southwest Region - Midhurst, Ontario Fire Marshall | Springwater |
|
| Ontario. Members of Provincial Parliament, Barrie-Springwater-Oro-Medonte Riding, Provincial Constituency Office - Doug Downey | Barrie |
|
| Ontario. Members of Provincial Parliament, Simcoe North Riding - Orillia Office, Provincial Constituency Office - Jill Dunlop, Simcoe North Riding | Orillia |
|
| Ontario. Ministry of Advanced Education and Skills Development, Employment Ontario Hotline | Toronto Downtown |
|
| Ontario. Ministry of Children, Community and Social Services | Barrie |
|
| Ontario. Ministry of Children, Community and Social Services, Barrie - Bayfield St, Youth Justice Division | Barrie |
|
| Ontario. Ministry of Children, Community and Social Services, Barrie - Ferris Lane, Passport Program | Barrie |
|
| Ontario. Ministry of Children, Community and Social Services, Newmarket Office, Special Services at Home and Assistance for Children with Severe Disabilities | Newmarket |
|
| Ontario. Ministry of Children, Community and Social Services, Post Adoption Disclosure Unit | Toronto |
|
| Ontario. Ministry of Children, Community and Social Services. Family Responsibility Office | Toronto |
|
| Ontario. Ministry of Children, Community and Social Services. Victim Support Line | Toronto |
|
| Ontario. Ministry of Community and Social Services, Employment and Training Start Up Benefit, Orillia | Orillia |
|
| Ontario. Ministry of Community and Social Services, Employment Supports, Orillia | Orillia |
|
| Ontario. Ministry of Economic Development and Growth, Simcoe Muskoka Office | Springwater |
|
| Ontario. Ministry of Education, Central East Region, Child Care Quality Assurance and Licensing | Toronto |
|
| Ontario. Ministry of Environment, Conservation and Parks | Barrie |
|
| Ontario. Ministry of Environment, Conservation and Parks, Awenda Provincial Park, Ontario Parks - Awenda Provincial Park | Penetanguishene |
|
| Ontario. Ministry of Environment, Conservation and Parks, Copeland Forest, Midhurst (Huronia) District Office | Springwater |
|
| Ontario. Ministry of Environment, Conservation and Parks, Midhurst District Office, Midhurst (Huronia) District Office | Springwater |
|
| Ontario. Ministry of Environment, Conservation and Parks, Oro-Medonte, Ontario Parks - Bass Lake Provincial Park | Orillia |
|
| Ontario. Ministry of Environment, Conservation and Parks, Port Severn, Ontario Parks - Six Mile Lake Provincial Park | Port Severn |
|
| Ontario. Ministry of Health, Trillium Drug Program | Etobicoke |
|
| Ontario. Ministry of Health, Health Care Connect | Toronto Downtown Central |
|
| Ontario. Ministry of Health, Health811 | Toronto Downtown Central |
|
| Ontario. Ministry of Health, Ontario Health Insurance Plan | Toronto Downtown Central |
|
| Ontario. Ministry of Health, Dental Care For Low-Income Seniors | Toronto |
|
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Online/Web Serivce, Labour Market Information | Ontario |
|
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Barrie Regional Office, Apprenticeship Office | Barrie |
|
| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Employment Ontario Contact Centre | Toronto |
|
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch | Toronto |
|
| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch, Central Region West, Newmarket, Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch, Central Region West, Newmarket | Newmarket |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Crown Attorney | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Justice of the Peace - Criminal Matters | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Victim / Witness Assistance Program | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Enforcement and Finance - Sheriff's Office | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Estates Administration | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Jury Line | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Civil Filing Office | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Family Court | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Small Claims Court | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 303, Family Law Information Centre | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 313, Manager of Court Operations Office | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 412, Superior Court of Justice - Trial Coordinators Office | Barrie |
|
| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 501, Ontario Court of Justice - Criminal Court | Barrie |
|
| Ontario. Ministry of the Attorney General. Justice Ontario | Toronto |
|
| Ontario. Ministry of the Solicitor General, Midland, Probation and Parole Services, Midland | Midland |
|
| Ontario. Ministry of the Solicitor General, Orillia, Probation and Parole Office, Orillia | Orillia |
|
| Ontario. Ministry of the Solicitor General, Penetanguishene, Central North Correctional Centre | Penetanguishene |
|
| Ontario. Ministry of Tourism, Culture and Sport, Barrie, Ontario Travel Information Centre | Barrie |
|
| Ontario. Ministry of Tourism, Culture and Sport, Midhurst Office, Grants Administration and Community Development | Springwater |
|
| Ontario. Ministry of Tourism, Culture and Sport, Midhurst Office, Tourism Regional Office | Springwater |
|
| Ontario. Ministry of Transportation, Barrie - Commerce Park Dr, Central Region - International Registration Plan | Barrie |
|
| Ontario. Ministry of Transportation, Barrie - No physical address, Senior Driver's Licence Renewal Program | Barrie |
|
| Operation Christmas Child, Simcoe West | Barrie |
|
| Operation Ukrainian Safe Haven | |
|
| OPP Chorus | Barrie |
|
| Optimum Potential Chiropractic and Nutrition | Orillia |
|
| Order of The Eastern Star - Manson J. Bradley Chapter, #240, Chapter # 240 - Midland, Order of The Eastern Star | Midland |
|
| Orillia & District Arts Council, Cretive Nomad Studios | Orillia |
|
| Orillia and Area Physician Recruitment and Retention Committee | Orillia |
|
| Orillia Central Preschool, St Bernard's Catholic Elementary School, Infant, Toddlers and Preschoolers Programs | Orillia |
|
| Orillia Community Nonprofit Housing Corporation | Orillia |
|
| Orillia Fertility Associates | Orillia |
|
| Orillia Fine Arts Association | Orillia |
|
| Orillia Museum of Art and History (The) | Orillia |
|
| Orillia Paediatric Teaching Associates | Orillia |
|
| Orillia Public Library, Orillia, General Services and Outreach | Orillia |
|
| Orillia Scottish Festival | Orillia |
|
| Orillia Soldiers' Memorial Hospital, Children's Therapy Services, Orillia - 170 Colborne St W | Orillia |
|
| Orillia Soldiers' Memorial Hospital, Emergency Department, Orillia - 170 Colborne St W | Orillia |
|
| Orillia Soldiers' Memorial Hospital, Midland - EarlyON Child and Family Centre, After Baby Group | Midland |
|
| Orillia Soldiers' Memorial Hospital, Orillia - 170 Colborne St W, Birthing Preparation Program | Orillia |
|
| Orillia Soldiers' Memorial Hospital, Outpatient Physiotherapy, Orillia - 170 Colborne St W | Orillia |
|
| Orillia Soldiers' Memorial Hospital, Regional Domestic Violence Treatment Centre, Orillia - 170 Colborne St W | Orillia |
|
| Orillia Soldiers' Memorial Hospital Foundation | Orillia |
|
| Orillia, City of, Orillia Wheelchair Limousine Service | Orillia |
|
| Orillia, City of, Orillia - 500 Gill St, Fire Department | Orillia |
|
| Orr Lake Golf Club | Elmvale |
|
| Orr Lake Ratepayers Association | |
|
| Osteoporosis Canada [Central East], Simcoe Muskoka - Mailing Address, Simcoe Muskoka Chapter | Clearview (Simcoe County) |
|
| Our Lady of Lourdes Catholic School. Elmvale | Elmvale |
|
| Our Town Food Bank | Tottenham |
|
| Ovarian Cancer Canada | Toronto Downtown |
|
| Overall Independence, Mailing Address | Barrie |
|
| Overeaters Anonymous, St Paul's Center Orillia OA Group, Living in Recovery | Orillia |
|
| Owen Hill Care Community, Barrie, Long Term Care Home | Barrie |
|
| Oxfam Canada | Ottawa |
|
| Oxford College, Bayfield Mall | Barrie |