| Organization Name(s) | Located In |
| Ontario. Members of Provincial Parliament | Toronto |
| Obtaining a copy of a Certificate of Divorce Decree | Ontario |
| Ontario. Ministry of Citizenship and Immigration, Ontario Honours and Awards Secretariat | Toronto |
| Ontario. Ministry of the Environment, Ontario's Drive Clean Program | Pickering |
| Obtaining a Birth Certificate - Births Outside of Ontario, Overview | Canada |
| Obtaining a Birth Certificate - Births Outside of Canada, Overview | International |
| Ontario. Ministry of Health and Long-Term Care, Wait Times in Ontario | Toronto |
| Oasis Centre des femmes | Toronto |
| Office of the Ombudsman of Ontario | Toronto |
| OmbudService for Life and Health Insurance | Toronto |
| Ombudsman for Banking Services and Investments | Toronto |
| One Parent Families Association of Canada. Pickering | Pickering |
| Ontario Addiction Treatment Centres | Owen Sound |
| Ontario Association for Marriage and Family Therapy | Tottenham |
| Ontario Association of Credit Counselling Services (The) | Grimsby |
| Ontario Association of Naturopathic Doctors | Toronto |
| Ontario Bean Producers' Marketing Board | London |
| Ontario Blue Cross | Etobicoke |
| Ontario Brain Injury Association | Thorold |
| Ontario Camps Association | Toronto |
| Ontario Canola Growers Association | Guelph |
| Ontario Chiropractic Association | Mississauga |
| Ontario Coalition for Better Child Care | Toronto |
| Ontario College Application Services | Guelph |
| Ontario College of Homeopathic Medicine | Toronto |
| Ontario College of Pharmacists | Toronto |
| Ontario College of Teachers | Toronto |
| Ontario Criminal Injuries Compensation Board | Toronto |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. Hanover, Hanover Site | Hanover |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. Kincardine Site | Kincardine (Town of) |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. M'Wikwedong | Owen Sound |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. Port Elgin | Port Elgin |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. Walkerton | Walkerton |
| Ontario Early Years Centre. Bruce-Grey-Owen Sound. Wiarton | Wiarton |
| Ontario Energy Board | Toronto |
| Ontario Federation for Cerebral Palsy, Programs,Services, Donation Pick-up | Toronto |
| Ontario Federation of Anglers and Hunters, Invading Species Awareness Program | Peterborough (City of) |
| Ontario Federation of Snowmobile Clubs | Barrie |
| Ontario Federation of Teaching Parents (The) | Ontario |
| Ontario Fencing Association | Hamilton |
| Ontario Health Insurance Plan (OHIP) | London |
| Ontario Health Study, Cancer Care Ontario | Owen Sound |
| Ontario Human Rights Commission | Toronto |
| Ontario Interpreting Services, After Hours Emergency Interpreting Service | Toronto |
| Ontario Long Term Care Association | Markham |
| Ontario March of Dimes. London, Home and Vehicle Modification Program | London |
| Ontario March of Dimes. Waterloo Office | Waterloo |
| Ontario Massage Therapist Association. Toronto Head Office | Etobicoke |
| Ontario Motor Vehicle Industry Council | North York |
| Ontario Native Literacy Coalition | Owen Sound |
| Ontario Network for the Prevention of Elder Abuse (The), Elder Abuse Hotline | Toronto |
| Ontario Poison Centre | Toronto |
| Ontario Press Council | Toronto |
| Ontario Provincial Police. Bruce Peninsula - Wiarton Detachment | Wiarton |
| Ontario Provincial Police. South Bruce. Kincardine Detachment | Kincardine (Town of) |
| Ontario Psychological Association, Psychologists Referral Service | Toronto |
| Ontario Retirement Communities Association | Oakville |
| Ontario Seniors' Secretariat, Seniors' INFOline | Toronto |
| Ontario Seventh Step Society | Bradford |
| Ontario Snow Resorts Association | Collingwood |
| Ontario Tenants Rights | Toronto |
| Ontario Trails Council | Kingston |
| Ontario Universities' Application Centre | Guelph |
| Ontario Women's Directorate | Toronto |
| Ontario Youth Apprenticeship Program, Bluewater District School Board & Bruce-Grey Catholic District School Board | Chesley |
| Ontario. Ministry of the Attorney General, Office for Victims of Crime | Toronto |
| Ontario. Children's Services INFOline | Ontario |
| Ontario. Economic Development & Trade Branch, Entrepreneurship Development, Summer Company Program | Toronto |
| Ontario. Elections Ontario, Office of The Chief Electoral Officer of Ontario | Toronto |
| Ontario. Employment Ontario, Apprenticeship Office, Owen Sound | Owen Sound |
| Ontario. Legislative Assembly of Ontario, Office of the Provincial Advocate for Children and Youth | Toronto |
| Ontario. Legislative Offices, Liberal Party of Ontario, Dalton McGuinty | Toronto |
| Ontario. Legislative Offices, New Democratic Party of Ontario Leader, Andrea Horwath | Toronto |
| Ontario. Legislative Offices, Premier Dalton McGuinty, Liberal Party of Ontario Leader | Toronto |
| Ontario. Legislative Offices. Bruce-Grey-Owen Sound. Owen Sound Office, Member of Provincial Parliament, Murdoch, Bill (Cons) | Owen Sound |
| Ontario. Legislative Offices. Bruce-Grey-Owen Sound. Toronto Office, Member of Provincial Parliament, Murdoch, Bill (Cons) | Toronto |
| Ontario. Legislative Offices. Huron-Bruce. Kincardine Office, Member of Provincial Parliament, Mitchell, Carol | Kincardine (Town of) |
| Ontario. Ministry of Agriculture Food and Rural Affairs | Guelph |
| Ontario. Ministry of Agriculture Food and Rural Affairs, Agricultural Information Contact Centre | Guelph |
| Ontario. Ministry of Agriculture Food and Rural Affairs, Nutrient Management Information Line | Guelph |
| Ontario. Ministry of Agriculture, Food and Rural Affairs. Guelph, Farm Finance Branch, Farm Property Class Tax Rate program | Guelph |
| Ontario. Ministry of Child and Youth Services, Child and Family Services Review Board | Toronto |
| Ontario. Ministry of Child and Youth Services, Custody Review Board | Toronto |
| Ontario. Ministry of Children and Youth Services | Owen Sound |
| Ontario. Ministry of Children and Youth Services, Ontario Child Benefit | Ontario |
| Ontario. Ministry of Children and Youth Services, South West Region | London |
| Ontario. Ministry of Children and Youth Services. Adoption Disclosure, Central Services, Adoption Disclosure Register | Toronto |
| Ontario. Ministry of Community and Social Services, Family Responsibility Office | Toronto |
| Ontario. Ministry of Community and Social Services. Owen Sound Office, Income Support Division, Ontario Disability Support Program | Owen Sound |
| Ontario. Ministry of Community and Social Services. Owen Sound Office, Ontario Disability Support Program, Income and Employment Supports, Employment Supports | Owen Sound |
| Ontario. Ministry of Community and Social Services. Social Assistance Programs, Social Benefits Tribunal | Toronto |
| Ontario. Ministry of Community Safety and Correctional Services, Owen Sound Jail | Owen Sound |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole Services Adults | Owen Sound |
| Ontario. Ministry of Community Safety and Correctional Services. Office of the Fire Marshall (The). Ontario Fire College, Resource Centre | Gravenhurst |
| Ontario. Ministry of Community Safety and Correctional Services. Ontario Provincial Police. General Headquarters and Central Region. Orillia | Orillia |
| Ontario. Ministry of Consumer Services, Consumer Protection Branch | Toronto |
| Ontario. Ministry of Culture, Ontario Seniors' Secretariat, Senior's Info | Ontario |
| Ontario. Ministry of Culture, Ontario Trillium Foundation [The] | Toronto |
| Ontario. Ministry of Education/Ministry of Training, Colleges and Universities, Communications Branch. Public Inquiries Unit | Toronto |
| Ontario. Ministry of Energy, Home Energy Retrofit Program | Ontario |
| Ontario. Ministry of Government Services, Access and Inquiry Services | Toronto |
| Ontario. Ministry of Government Services, ServiceOntario, Specialty Services. Change of Name | Thunder Bay |
| Ontario. Ministry of Government Services. Central Production and Varification Services Branch | Toronto |
| Ontario. Ministry of Government Services. Companies and Personal Property Security Branch | Toronto |
| Ontario. Ministry of Government Services. Office of the Registrar General | Toronto |
| Ontario. Ministry of Government Services. ServiceOntario Retail Branch, Land Registration and Vehicle Driver Registration, Bruce Regional Office | Walkerton |
| Ontario. Ministry of Health and Long-Term Care, Assistive Devices Program | Toronto |
| Ontario. Ministry of Health and Long-Term Care, AIDS and Sexual Health Infoline/The Mainline | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Health Care Connect | Ontario |
| Ontario. Ministry of Health and Long-Term Care, Health Information Centre Infoline | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Ontario Drug Benefit Program | Etobicoke |
| Ontario. Ministry of Health and Long-Term Care, Ontario Hepatitis C Assistance Plan | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Trillium Drug Program | North York |
| Ontario. Ministry of Health and Long-Term Care, www.HealthyOntario.com | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Your Health Care Options | Ontario |
| Ontario. Ministry of Health and Long-Term Care. Registry and Claims Branch. Owen Sound Office, OHIP Card | Owen Sound |
| Ontario. Ministry of Labour | Ontario |
| Ontario. Ministry of Labour, Office of the Employer Adviser | Toronto |
| Ontario. Ministry of Labour. Pay Equity Commission | Toronto |
| Ontario. Ministry of Labour. Waterloo Office, Office of the Worker Adviser | Waterloo |
| Ontario. Ministry of Municipal Affairs and Housing, Investigation and Enforcement Unit (Maintenance and Standards Section) | Toronto |
| Ontario. Ministry of Natural Resources, Ontario Parks, MacGregor Point Provincial Park | Port Elgin |
| Ontario. Ministry of Natural Resources, Owen Sound Area Office | Owen Sound |
| Ontario. Ministry of Natural Resources, Youth Programs | Peterborough (City of) |
| Ontario. Ministry of Natural Resources. Angus, Ontario Tree Seed Facility | Angus |
| Ontario. Ministry of Natural Resources. Peterborough, Outdoors Card Centre | Peterborough (City of) |
| Ontario. Ministry of Revenue. Client Accounts and Services Branch, Guaranteed Annual Income System | Oshawa |
| Ontario. Ministry of Revenue. Client Accounts and Services Branch, Ontario Child Care Supplement for Working Families | Oshawa |
| Ontario. Ministry of Revenue. Client Accounts and Services Branch, Ontario Tax Credit System | Oshawa |
| Ontario. Ministry of Revenue. Client Accounts and Services Branch, RST Centralized Programs | Oshawa |
| Ontario. Ministry of Revenue. Hamilton Tax Office, Client Accounts and Services Branch | Hamilton |
| Ontario. Ministry of Revenue. Kitchener Tax Office, Client Accounts and Services Branch | Kitchener |
| Ontario. Ministry of the Attorney General | Toronto |
| Ontario. Ministry of the Attorney General, Family Law Information Centre | Owen Sound |
| Ontario. Ministry of the Attorney General, Family Law Information Centre | Walkerton |
| Ontario. Ministry of the Attorney General, Justice Ontario | Toronto |
| Ontario. Ministry of the Attorney General, Ontario Victim Services Secretariat, Victim/Witness Assistance Program, Owen Sound & Walkerton | Owen Sound |
| Ontario. Ministry of the Attorney General. Children's Lawyer | Toronto |
| Ontario. Ministry of the Attorney General. Office of the Public Guardian and Trustee | Toronto |
| Ontario. Ministry of the Attorney General. Ontario Court. Crown Attorney | Walkerton |
| Ontario. Ministry of the Attorney General. Ontario Court. Crown Attorney | Owen Sound |
| Ontario. Ministry of the Attorney General. Owen Sound Office, Ontario Court of Justice. Criminal | Owen Sound |
| Ontario. Ministry of the Attorney General. Owen Sound Office, Ontario Court of Justice. Family Court | Owen Sound |
| Ontario. Ministry of the Attorney General. Owen Sound Office, Ontario Superior Court of Justice, Small Claims Court | Owen Sound |
| Ontario. Ministry of the Attorney General. Toronto, Ontario Victim Services Secretariat, Victim Support Line | Toronto |
| Ontario. Ministry of the Attorney General. Walkerton Office, Ontario Court of Justice. Criminal | Walkerton |
| Ontario. Ministry of the Attorney General. Walkerton Office, Ontario Court of Justice. Family Court | Walkerton |
| Ontario. Ministry of the Attorney General. Walkerton Office, Ontario Superior Court of Justice, Small Claims Court | Walkerton |
| Ontario. Ministry of the Attorney General. Walkerton Office, Superior Court of Justice. Family Court | Walkerton |
| Ontario. Ministry of the Environment. North York, Spills Action Centre | North York |
| Ontario. Ministry of the Environment. Owen Sound Area Office | Owen Sound |
| Ontario. Ministry of Tourism | Toronto |
| Ontario. Ministry of Tourism, Tourism Marketing Partnership Corporation, Ontario Travel Information Centre | Barrie |
| Ontario. Ministry of Training, Colleges and Universities, Adjustment Advisory Program | Toronto |
| Ontario. Ministry of Training, Colleges and Universities, Employment Ontario Hotline | Toronto |
| Ontario. Ministry of Training, Colleges and Universities, Student Support Branch | Thunder Bay |
| Ontario. Ministry of Transportation | Toronto |
| Ontario. Ministry of Transportation, Adopt-A-Highway Program | London |
| Ontario. Ministry of Transportation. Customer Service Office, Road Conditions/Construction Information Service | St Catharines |
| Ontario. Ministry of Transportation. Regional Operations. Chesley Outlet, Drivers and Vehicles Licence Office | Chesley |
| Ontario. Ministry of Transportation. Regional Operations. Kincardine Outlet, Drivers and Vehicles Licence Office | Kincardine (Town of) |
| Ontario. Ministry of Transportation. Regional Operations. Owen Sound Outlet, Driver Examination Centre | Owen Sound |
| Ontario. Ministry of Transportation. Regional Operations. Walkerton Outlet, Driver Examination Centre | Walkerton |
| Ontario. Ministry of Transportation. Regional Operations. Wiarton Outlet, Drivers and Vehicles Licence Office | Wiarton |
| Ontario. ServiceOntario, Port Elgin | Port Elgin |
| Ontario. ServiceOntario. Owen Sound | Owen Sound |
| Ontario. ServiceOntario. Publications Ontario | Toronto |
| Operation Christmas Child, Chesley | Chesley |
| Operation Eyesight Universal, Central Canada Region Office | Scarborough |
| Optimum Childcare Nannies and Senior Care Givers Inc | Vancouver |
| Organ Donation and Transplant Association Canada | Stratford |
| Ornge Communications Centre | Toronto |
| Osteoporosis Canada | Toronto |
| Osteoporosis Canada, Grey Bruce Chapter | Chatsworth |
| Owen Sound and District Chamber of Commerce | Owen Sound |
| Owen Sound Attack Major Jr A Hockey | Owen Sound |
| Owen Sound Audiology Clinic | Owen Sound |
| Owen Sound Canadian Reformed Church | Chatsworth |
| Owen Sound Crisis Pregnancy Centre | Owen Sound |
| Owen Sound Farmers' Market | Owen Sound |
| Owen Sound Regional Hospital Foundation | Owen Sound |
| Owen Sound Veterinary Clinic | Owen Sound |
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