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| Oasis Centre des femmes | Toronto |
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| OCD North | Barrie |
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| OCD Wellness | Barrie |
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| Ombudsman Ontario | Toronto |
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| Ontario Aboriginal Housing Services | Sault Ste. Marie |
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| Ontario Addiction Treatment Centres, Alliston Office | New Tecumseth |
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| Ontario Association of Optometrists, Eye See...Eye Learn | Toronto Downtown Central |
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| Ontario College Application Service | Guelph |
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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 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 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 - Sperling Dr | Barrie |
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| Ontario Health atHome, Barrie - Sperling Dr, Telehomecare | 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 Incontinence Supplies | New Tecumseth |
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| Ontario Motor Vehicle Industry Council | Toronto |
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| Ontario Nature | Toronto Downtown |
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| Ontario Parents Advocating for Children with Cancer | Barrie |
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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, Alliston, Nottawasaga Detachment | New Tecumseth |
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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 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 Track3 Adaptive Sports Association, Toronto - Administrative Office | Toronto |
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| Ontario Vipassana Centre, Egbert, Dhamma Torana | |
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| Ontario Water Centre (The) | Georgina |
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| Ontario, Ministry of the Solicitor General, Barrie, Probation and Parole Services, Barrie | Barrie |
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| Ontario, Ministry of the Solicitor General, Southwest Region - Midhurst, Ontario Fire Marshall | Springwater |
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| Ontario. Members of Provincial Parliament, Barrie-Innisfil Riding, Provincial Constituency Office - Andrea Khanjin | Barrie |
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| Ontario. Members of Provincial Parliament, Provincial Constituency Office - Brian Saunderson, Simcoe-Grey Riding - Stayner Office, Simcoe-Grey Riding - Stayner Office | Stayner |
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| Ontario. Members of Provincial Parliament, Simcoe-Grey Riding - Alliston Office, Provincial Constituency Office - Brian Saunderson, Simcoe-Grey Riding - Alliston Office | Alliston |
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| Ontario. Members of Provincial Parliament, York-Simcoe Riding, Provincial Constituency Office - Caroline Mulroney | East Gwillimbury |
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| Ontario. Ministry of Advanced Education and Skills Development, Employment Ontario Hotline | Toronto Downtown |
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| Ontario. Ministry of Children, Community and Social Services | Barrie |
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| Ontario. Ministry of Children, Community and Social Services, Barrie - 34 Simcoe St, Ontario Disability Support Program - Employment Support Program | Barrie |
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| Ontario. Ministry of Children, Community and Social Services, Barrie - 34 Simcoe St, Ontario Disability Support Program | Barrie |
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| Ontario. Ministry of Children, Community and Social Services, Barrie - Bayfield St, Youth Justice Division | Barrie |
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| Ontario. Ministry of Children, Community and Social Services, Barrie - Ferris Lane, Passport Program | Barrie |
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| Ontario. Ministry of Children, Community and Social Services, Newmarket Office, Special Services at Home and Assistance for Children with Severe Disabilities | Newmarket |
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| Ontario. Ministry of Children, Community and Social Services, Post Adoption Disclosure Unit | Toronto |
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| Ontario. Ministry of Children, Community and Social Services. Family Responsibility Office | Toronto |
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| Ontario. Ministry of Children, Community and Social Services. Victim Support Line | Toronto |
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| Ontario. Ministry of Economic Development and Growth, Simcoe Muskoka Office | Springwater |
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| Ontario. Ministry of Economic Development, Trade and Employment/Ministry of Research and Innovation, 56 Wellesley St. W, Entrepeneur Branch Summer Company Program | Toronto Downtown |
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| Ontario. Ministry of Education, Central East Region, Child Care Quality Assurance and Licensing | Toronto |
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| Ontario. Ministry of Environment, Conservation and Parks | Barrie |
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| Ontario. Ministry of Environment, Conservation and Parks, Aurora District Office, Holland Marsh Provincial Wildlife Management Area | Bradford West Gwillimbury |
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| Ontario. Ministry of Environment, Conservation and Parks, Thornbury, Niagara Escarpment Commission | Blue Mountains |
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| Ontario. Ministry of Finance., Oshawa, Retail Sales Tax | Oshawa |
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| Ontario. Ministry of Government and Consumer Services. Consumer Protection Ontario | Toronto |
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| Ontario. Ministry of Health, Trillium Drug Program | Etobicoke |
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| Ontario. Ministry of Health, Health Care Connect | Toronto Downtown Central |
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| Ontario. Ministry of Health, Health811 | Toronto Downtown Central |
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| Ontario. Ministry of Health, Ontario Health Insurance Plan | Toronto Downtown Central |
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| Ontario. Ministry of Health, Dental Care For Low-Income Seniors | Toronto |
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| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Barrie Regional Office, Apprenticeship Office | Barrie |
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| Ontario. Ministry of Labour, Immigration, Training and Skills Development, Employment Ontario Contact Centre | Toronto |
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| Ontario. Ministry of Labour, Immigration, Training and Skills Development. Employment Practices Branch | Toronto |
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| 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 |
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| Ontario. Ministry of Municipal Affairs and Housing. Rental Housing Enforcement Unit | Toronto |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Crown Attorney | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Justice of the Peace - Criminal Matters | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - 5th Floor, Victim / Witness Assistance Program | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Enforcement and Finance - Sheriff's Office | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Estates Administration | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Jury Line | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Civil Filing Office | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Family Court | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Office 301, Superior Court of Justice - Small Claims Court | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 303, Family Law Information Centre | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 313, Manager of Court Operations Office | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 412, Superior Court of Justice - Trial Coordinators Office | Barrie |
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| Ontario. Ministry of the Attorney General, Barrie Courthouse - Room 501, Ontario Court of Justice - Criminal Court | Barrie |
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| Ontario. Ministry of the Attorney General, Toronto, Office for Victims of Crime | Toronto Downtown |
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| Ontario. Ministry of the Attorney General. Justice Ontario, Toronto | Toronto |
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| Ontario. Ministry of the Attorney General. Office of the Public Guardian and Trustee | Toronto |
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| Ontario. Ministry of the Solicitor General, Alliston Office, Probation and Parole Services, Alliston Office | New Tecumseth |
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| Ontario. Ministry of the Solicitor General, Penetanguishene, Central North Correctional Centre | Penetanguishene |
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| Ontario. Ministry of Tourism, Culture and Sport, Barrie, Ontario Travel Information Centre | Barrie |
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| Ontario. Ministry of Tourism, Culture and Sport, Midhurst Office, Grants Administration and Community Development | Springwater |
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| Ontario. Ministry of Tourism, Culture and Sport, Midhurst Office, Tourism Regional Office | Springwater |
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| Ontario. Ministry of Transportation, Barrie - Commerce Park Dr, Central Region - International Registration Plan | Barrie |
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| Open Arms Early Childhood Centre, Barrie, Child Care Program | Barrie |
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| Operation Christmas Child, Simcoe West | Barrie |
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| Operation Ukrainian Safe Haven | |
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| OPP Chorus | Barrie |
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| Orillia Soldiers' Memorial Hospital, Children's Therapy Services, Orillia - 170 Colborne St W | Orillia |
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| Orillia Soldiers' Memorial Hospital, North Simcoe Muskoka Regional Genetics Program, Orillia - 170 Colborne St W | Orillia |
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| Orillia Soldiers' Memorial Hospital, Regional Domestic Violence Treatment Centre, Orillia - 170 Colborne St W | Orillia |
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| Orillia Soldiers' Memorial Hospital, Sexual Assault Treatment Centre, Orillia - 170 Colborne St W | Orillia |
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| Orillia Soldiers' Memorial Hospital, Speech Language Pathology, Orillia - 170 Colborne St W | Orillia |
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| Oro-Medonte Township, Oro-Medonte - Line 7 S, Municipal Office | Oro-Medonte |
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| Our Town Food Bank | Tottenham |
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| Ovarian Cancer Canada | Toronto Downtown |
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| Overall Independence, Mailing Address | Barrie |
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| Overeaters Anonymous, Mailing Address, Central Ontario Intergroup | |
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| Oxford College, Bayfield Mall | Barrie |