| Organization Name(s) | Located In |
| O'Connor Conmee Baptist Church | Kakabeka Falls |
| O'Connor Free Methodist Church | Kakabeka Falls |
| Odulana-Ogundimu, Dr Adebola, Pediatrician | Sudbury |
| Office of Child And Family Service Advocacy | Toronto |
| Office of the Chief Coroner | Thunder Bay |
| Office of the Provincial Advocate for Children and Youth | Toronto |
| Ogden Child Care Centre | Thunder Bay |
| Ogden Community Centre | Thunder Bay |
| Ogden Rainbow Seniors Club | Thunder Bay |
| Ogden, Craig, Physiotherapist | Iroquois Falls |
| Ojibway and Cree Cultural Centre | Timmins |
| Ojibway Family Resource Centre | North Bay |
| Olimb, Darlene R, Counselling and Consulting Services | Thunder Bay |
| Oliver Agricultural Society | Murillo |
| Oliver Community Complex | Murillo |
| Oliver Road Community Centre | Thunder Bay |
| OmbudService for Life and Health Insurance | Toronto |
| Ombudsman for Seniors for the Region of Hearst | Hearst |
| Ontario. Ministry of Community Safety and Correctional Services, Emergency Management Ontario | Toronto |
| Onaping Falls Badminton Club | Onaping Falls |
| Onaping Falls Golden Age Club | Onaping Falls |
| Onaping Falls Nordics Ski Club | Chelmsford |
| Onaping Oldtimers Hockey Team | Onaping Falls |
| One-Eleven Senior Citizens Centre Inc. | Sudbury |
| Ontario Addiction Treatment Centres, Methadone Maintenance Program | Mobert |
| Ontario Addiction Treatment Centres, Methadone Maintenance Program | Longlac |
| Ontario Addiction Treatment Centres, Methadone Maintenance Program | Dryden |
| Ontario Addiction Treatment Centres, Methadone Maintenance Program, Cumberland Street Site | Thunder Bay |
| Ontario Addiction Treatment Centres, Methadone Maintenance Program, Victoria Avenue Site | Thunder Bay |
| Ontario Archaeological Society, Thunder Bay Chapter | Thunder Bay |
| Ontario Arts Council | Sudbury |
| Ontario Arts Council | Thunder Bay |
| Ontario Association for Families of Children with Communication Disorders, Thunder Bay Chapter | Thunder Bay |
| Ontario Association of Social Workers, Northwestern Branch | Thunder Bay |
| Ontario Civilian Commission on Police Services | Toronto |
| Ontario Coalition for Better Child Care | Toronto |
| Ontario Community Support Association | Toronto |
| Ontario Early Years Centre North | Lively |
| Ontario English Catholic Teachers' Association | Sault Ste Marie |
| Ontario Federation of Anglers and Hunters, Zone B | Thunder Bay |
| Ontario Genealogical Society, Sault Ste Marie and District Branch | Sault Ste Marie |
| Ontario Genealogical Society, Thunder Bay District Branch | Thunder Bay |
| Ontario Healthy Communities Coalition | Toronto |
| Ontario Human Rights Commission | Toronto |
| Ontario Institute for Studies In Education | Toronto |
| Ontario Lottery and Gaming Corporation | Sault Ste Marie |
| Ontario Lupus Association, Linda Ethier Chapter | Sudbury |
| Ontario March of Dimes | Sudbury |
| Ontario March of Dimes | North Bay |
| Ontario March of Dimes | Sault Ste Marie |
| Ontario March of Dimes | Elliot Lake |
| Ontario March of Dimes | Thunder Bay |
| Ontario March of Dimes, Computer Skills Training | Thunder Bay |
| Ontario March of Dimes, Employment Assistance Service, Second Career | Timmins |
| Ontario March of Dimes, Employment Service Centre | Thunder Bay |
| Ontario March of Dimes, Employment Services | Sudbury |
| Ontario March of Dimes, Employment Services | Sault Ste Marie |
| Ontario March of Dimes, Home and Vehicle Modification Program | Thunder Bay |
| Ontario Multifaith Council on Spiritual and Religious Care, Regional Multifaith Committee | Thunder Bay |
| Ontario Native Women's Association | Thunder Bay |
| Ontario Native Women's Association | Geraldton |
| Ontario Network for the Prevention of Elder Abuse (The) | Thunder Bay |
| Ontario Northland Transportation Commission | North Bay |
| Ontario Nurses Association | Thunder Bay |
| Ontario Prader Willi Syndrome Association | Toronto |
| Ontario Provincial Police | Thunder Bay |
| Ontario Provincial Police | Geraldton |
| Ontario Provincial Police | Sudbury |
| Ontario Provincial Police | Sault Ste Marie |
| Ontario Provincial Police, North East Region Headquarters | North Bay |
| Ontario Psychological Association, Psychologists Referral Service | Toronto |
| Ontario Public Service Employees Union, Region 6 | Sault Ste Marie |
| Ontario Regional Service Committee of Narcotics Anonymous | Sault Ste Marie |
| Ontario Registered Music Teachers' Association, Sault Ste Marie Branch | Sault Ste Marie |
| Ontario Retirement Communities Association | Mississauga |
| Ontario Sailing Association, Zone 7 Superior | Thunder Bay |
| Ontario Secondary School Teachers' Federation, District 2 | Sault Ste Marie |
| Ontario Society for the Prevention of Cruelty to Animals (OSPCA) | Sudbury |
| Ontario Special Olympics | Sault Ste Marie |
| Ontario Students Against Impaired Driving, Region 11 | Sault Ste Marie |
| Ontario Telemedicine Network | Toronto |
| Ontario Thalassemia Foundation, Thunder Bay Chapter | Thunder Bay |
| Ontario Tourism Marketing Partnership Corporation, Ontario Travel Information Centre | Sault Ste Marie |
| Ontario Trillium Foundation (The) | Sault Ste Marie |
| Ontario Trillium Foundation (The) | Thunder Bay |
| Ontario Volleyball Association | Thunder Bay |
| Ontario Wellness Pain Control Organization, Wellness Centre | North Bay |
| Ontario Women's Health Network | Toronto |
| Ontario WorkinfoNet | Sault Ste Marie |
| Ontario. Employment Ontario, Apprenticeship Office, Kenora | Kenora |
| Ontario. Employment Ontario, Apprenticeship Office, North Bay | North Bay |
| Ontario. Employment Ontario, Apprenticeship Office, Sault Ste Marie Regional Office | Sault Ste Marie |
| Ontario. Employment Ontario, Apprenticeship Office, Sudbury Regional Office | Sudbury |
| Ontario. Employment Ontario, Apprenticeship Office, Timmins Regional Office | Timmins |
| Ontario. Employment Ontario, Employment and Training Division, North Region Branch | Thunder Bay |
| Ontario. Employment Ontario, Literacy and Basic Skills | Thunder Bay |
| Ontario. Member of Provincial Parliament, Kenora and Rainy River, Constituency Office | Dryden |
| Ontario. Member of Provincial Parliament, Nickel Belt Riding, Constituency Office | Hanmer |
| Ontario. Member of Provincial Parliament, Sault Ste Marie Riding, Constituency Office | Sault Ste Marie |
| Ontario. Member of Provincial Parliament, Thunder Bay Atikokan, Constituency Office | Thunder Bay |
| Ontario. Member of Provincial Parliament, Thunder Bay Superior North, Constituency Office | Thunder Bay |
| Ontario. Ministry of Aboriginal Affairs | Toronto |
| Ontario. Ministry of Agriculture, Food and Rural Affairs | Thunder Bay |
| Ontario. Ministry of Agriculture, Food and Rural Affairs | Thessalon |
| Ontario. Ministry of Agriculture, Food and Rural Affairs, Northern Ontario Regional Office | Verner |
| Ontario. Ministry of Children and Youth Services, Adoption Disclosure Register | Toronto |
| Ontario. Ministry of Children and Youth Services, Assistance for Children with Severe Disabilities Program | Thunder Bay |
| Ontario. Ministry of Children and Youth Services, Assistance for Children with Severe Disabilities Program | Sudbury |
| Ontario. Ministry of Children and Youth Services, Regional Office | Sudbury |
| Ontario. Ministry of Children and Youth Services, Special Services at Home Program | Sudbury |
| Ontario. Ministry of Children and Youth Services, Special Services at Home Program | Thunder Bay |
| Ontario. Ministry Of Children and Youth Services, Youth Justice Services | Kenora |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services | Sault Ste Marie |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services | Thunder Bay |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services | Geraldton |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services | Marathon |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Donald Doucet Youth Centre | Sault Ste Marie |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Justice Ronald Lester Youth Centre | Thunder Bay |
| Ontario. Ministry of Citizenship and Immigration, Citizenship, Culture, Sport & Recreation | Sudbury |
| Ontario. Ministry of Citizenship and Immigration, Citizenship, Tourism & Culture, Health Promotion, Regional Office | Sault Ste Marie |
| Ontario. Ministry of Citizenship and Immigration, Communications Branch, Automated Access System | Toronto |
| Ontario. Ministry of Citizenship and Immigration, Ministry of Culture, Ministry of Health Promotion, Northwest Area Office | Thunder Bay |
| Ontario. Ministry of Community and Social Services | Thunder Bay |
| Ontario. Ministry of Community and Social Services, Family Responsibility Office | Toronto |
| Ontario. Ministry of Community and Social Services, Ontario Disability Support Program | Thunder Bay |
| Ontario. Ministry of Community and Social Services, Ontario Disability Support Program | Sault Ste Marie |
| Ontario. Ministry of Community and Social Services, Ontario Disability Support Program | Kenora |
| Ontario. Ministry of Community Safety and Correctional Services, Algoma Treatment and Remand Centre | Sault Ste Marie |
| Ontario. Ministry of Community Safety and Correctional Services, Monteith Correctional Complex | Monteith |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole | Thunder Bay |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole | Sudbury |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole | Sault Ste Marie |
| Ontario. Ministry of Community Safety and Correctional Services, Thunder Bay Correctional Centre | Thunder Bay |
| Ontario. Ministry of Community Safety and Correctional Services, Thunder Bay District Jail | Thunder Bay |
| Ontario. Ministry of Consumer and Business Services, Office of the Registrar General, Birth Marriage and Death Certificates | Thunder Bay |
| Ontario. Ministry of Culture, Heritage Operations Unit, Heritage Planning and Archaeology | Thunder Bay |
| Ontario. Ministry of Education, Thunder Bay Regional Office | Thunder Bay |
| Ontario. Ministry of Energy and Infrastructure, Ontario Realty Corporation | Thunder Bay |
| Ontario. Ministry of Finance, Ontario Child Care Supplement for Working Families | Oshawa |
| Ontario. Ministry of Finance, Thunder Bay District Tax Office | Thunder Bay |
| Ontario. Ministry of Government Services, Consumer Protection Branch | Toronto |
| Ontario. Ministry of Health & Long Term Care, Trillium Drug Program | North York |
| Ontario. Ministry of Health and Long Term Care, Assistive Devices Program | North York |
| Ontario. Ministry of Health and Long Term Care, Emergency Health Services | Thunder Bay |
| Ontario. Ministry of Health And Long Term Care, Health Care Connect | Ontario |
| Ontario. Ministry of Health and Long Term Care, Laboratory Services Branch | Thunder Bay |
| Ontario. Ministry of Health and Long Term Care, Northern Health Travel Grant | Thunder Bay |
| Ontario. Ministry of Health And Long Term Care, Ontario Drug Benefit Program For Seniors | Thunder Bay |
| Ontario. Ministry of Health And Long Term Care, Ontario Health Insurance Plan | Thunder Bay |
| Ontario. Ministry of Labour, Employment Standards Program | Thunder Bay |
| Ontario. Ministry of Labour, Northern Region | Thunder Bay |
| Ontario. Ministry of Labour, Office Of The Employer Adviser | Toronto |
| Ontario. Ministry of Labour, Office of the Worker Adviser | Thunder Bay |
| Ontario. Ministry of Labour, Regional Office | Sault Ste Marie |
| Ontario. Ministry of Municipal Affairs and Housing, Landlord and Tenant Board, Client Service Office | Thunder Bay |
| Ontario. Ministry of Municipal Affairs and Housing, Municipal Services | Thunder Bay |
| Ontario. Ministry of Municipal Affairs and Housing, Northwestern Regional Office | Thunder Bay |
| Ontario. Ministry of Municipal Affairs and Housing, Rural and Native Housing Program | Sault Ste Marie |
| Ontario. Ministry of Natural Resources | Thunder Bay |
| Ontario. Ministry of Natural Resources, Natural Resources Centre, Northwest Region | Thunder Bay |
| Ontario. Ministry of Natural Resources, Northeast Regional Office | South Porcupine |
| Ontario. Ministry of Natural Resources, Northwest Regional Office | Thunder Bay |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development, Regional Economic Development | Sault Ste Marie |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development, Regional Economic Development | Blind River |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development, Regional Economic Development | Chapleau |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development, Regional Economic Development | Elliot Lake |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development, Regional Economic Development | Wawa |
| Ontario. Ministry of Northern Development Mines and Forestry, Northern Development Division, Regional Economic Development Branch, Thunder Bay Area Team | Thunder Bay |
| Ontario. Ministry of Revenue, Guaranteed Annual Income System | Oshawa |
| Ontario. Ministry Of The Attorney General | Sault Ste Marie |
| Ontario. Ministry of the Attorney General, Criminal Injuries Compensation Board | Toronto |
| Ontario. Ministry of the Attorney General, Crown Attorney | Thunder Bay |
| Ontario. Ministry of the Attorney General, Crown Attorney | Timmins |
| Ontario. Ministry of the Attorney General, Justices of the Peace | Thunder Bay |
| Ontario. Ministry of the Attorney General, Office of the Public Guardian and Trustee | Toronto |
| Ontario. Ministry of the Attorney General, Office of the Public Guardian and Trustee | Thunder Bay |
| Ontario. Ministry of the Attorney General, Ontario Court of Justice | Thunder Bay |
| Ontario. Ministry of the Attorney General, Ontario Court of Justice, Family Court | Thunder Bay |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim And Witness Assistance Program | Thunder Bay |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Gore Bay |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Fort Frances |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Dryden |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Kenora |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Timmins |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Haileybury |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Kapuskasing |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Sault Ste Marie |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Elliot Lake |
| Ontario. Ministry Of The Attorney General, Ontario Victim Services Secretariat, Victim Witness Assistance Program | Sudbury |
| Ontario. Ministry of the Attorney General, Provincial Court, Peace Bond | Thunder Bay |
| Ontario. Ministry of the Attorney General, Superior Court of Justice | Thunder Bay |
| Ontario. Ministry of the Attorney General, Superior Court of Justice, Small Claims Court | Thunder Bay |
| Ontario. Ministry of the Attorney General, Victim Support Line | Toronto |
| Ontario. Ministry of the Environment | Sault Ste Marie |
| Ontario. Ministry of the Environment, Northern Region Office | Thunder Bay |
| Ontario. Ministry of Training Colleges and Universities, Ontario Student Assistance Program, Student Support Branch | Thunder Bay |
| Ontario. Ministry of Transportation | Sault Ste Marie |
| Ontario. Ministry of Transportation, Northwestern Regional Office | Thunder Bay |
| Ontario. ServiceOntario | Terrace Bay |
| Ontario. ServiceOntario | Garson |
| Ontario. ServiceOntario | Lively |
| Ontario. ServiceOntario | Val Caron |
| Ontario. ServiceOntario | Chelmsford |
| Ontario. ServiceOntario | Massey |
| Ontario. ServiceOntario | Espanola |
| Ontario. ServiceOntario | Red Lake |
| Ontario. ServiceOntario | Spragge |
| Ontario. ServiceOntario | Sioux Lookout |
| Ontario. ServiceOntario | Ignace |
| Ontario. ServiceOntario | Blind River |
| Ontario. ServiceOntario | Chapleau |
| Ontario. ServiceOntario | Elliot Lake |
| Ontario. ServiceOntario | Cochrane |
| Ontario. ServiceOntario | Hearst |
| Ontario. ServiceOntario | Kapuskasing |
| Ontario. ServiceOntario | Moosonee |
| Ontario. ServiceOntario | South Porcupine |
| Ontario. ServiceOntario | Wawa |
| Ontario. ServiceOntario | Iroquois Falls |
| Ontario. ServiceOntario | Hornepayne |
| Ontario. ServiceOntario | Pickle Lake |
| Ontario. ServiceOntario | Dubreuilville |
| Ontario. ServiceOntario | Geraldton |
| Ontario. ServiceOntario | White River |
| Ontario. ServiceOntario | Dryden |
| Ontario. ServiceOntario | Marathon |
| Ontario. ServiceOntario | Nipigon |
| Ontario. ServiceOntario | Rainy River |
| Ontario. ServiceOntario | Longlac |
| Ontario. ServiceOntario | Emo |
| Ontario. ServiceOntario | Atikokan |
| Ontario. ServiceOntario | Beardmore |
| Ontario. ServiceOntario | Schreiber |
| Ontario. ServiceOntario, 2 Manitou Road Site | Manitouwadge |
| Ontario. ServiceOntario, 40 Manitou Road Site | Manitouwadge |
| Ontario. ServiceOntario, Balmoral Street Site | Thunder Bay |
| Ontario. ServiceOntario, Bay Street Site | Sault Ste Marie |
| Ontario. ServiceOntario, Bruce Street Site | Sault Ste Marie |
| Ontario. ServiceOntario, Central Production and Verification Services Branch, Land Registry Office | Fort Frances |
| Ontario. ServiceOntario, Central Production and Verification Services Branch, Land Registry Office | Thunder Bay |
| Ontario. ServiceOntario, Central Production and Verification Services Branch, Land Registry Office | Sault Ste Marie |
| Ontario. ServiceOntario, Dawson Road Site | Thunder Bay |
| Ontario. ServiceOntario, Fort William Road Site | Thunder Bay |
| Ontario. ServiceOntario, Foster Drive Site | Sault Ste Marie |
| Ontario. ServiceOntario, James Street Site | Thunder Bay |
| Ontario. ServiceOntario, McIntyre Road Site | Timmins |
| Ontario. ServiceOntario, Pine Street North Site | Timmins |
| Ontario. ServiceOntario, Scott Street and Butler Avenue Site | Fort Frances |
| Ontario. ServiceOntario, Scott Street and Reid Avenue Site | Fort Frances |
| Opasatika Township | Opasatika |
| Operation Come Home | Ottawa |
| Options Communications | Sudbury |
| OPTIONS northwest | Thunder Bay |
| OPTIONS northwest, Community Resource Team | Thunder Bay |
| OPTIONS northwest, Personal Support Services | Thunder Bay |
| Orchid Cellmark | New Westminster |
| Order of the Eastern Star, Argyle Chapter 10 | Thunder Bay |
| Organizme Solutions, Home and Office Organizing | Sault Ste Marie |
| Orthotic Centre (The) | Sudbury |
| Oshki Pimache O Win Education and Training Institute | Thunder Bay |
| Osteoporosis Canada | Toronto |
| Other Ways Now Program | Kenora |
| Our Children Our Future | Hanmer |
| Our Children Our Future | Sudbury |
| Our Children Our Future, Cooking Club and Collective Kitchen | Espanola |
| Our Children Our Future, Parent and Child Activities | Sudbury |
| Our Children Our Future, Parent and Child Activities | Massey |
| Our Children Our Future, Parent and Child Activities | Sudbury |
| Our Children Our Future, Parent and Child Activities | St Charles |
| Our Children Our Future, Parent and Child Activities | Markstay |
| Our Children Our Future, Parent and Child Activities | Noëlville |
| Our Children Our Future, Parent Education Courses | Val Caron |
| Our Kids Count of Thunder Bay Inc | Thunder Bay |
| Our Lady of Hope | Sudbury |
| Our Lady of Loretto | Thunder Bay |
| Our Saviour Lutheran Church | Dryden |
| Our Saviour's Lutheran Church | Thunder Bay |
| Overeaters Anonymous | Thunder Bay |
| Overeaters Anonymous | Sudbury |
