| Organization Name(s) | Located In |
| Ontario. Members of Provincial Parliament | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Wait Times in Ontario | Toronto |
| O'Brien (Marion) | Barrie |
| O'Halloran [Dr Harry] | Collingwood |
| O'Halloran [Dr Patrick] | Midland |
| O'Kane [Carol and Michael], Marriage Officers | Oro-Medonte |
| O.U.R. Club | Barrie |
| Oak Terrace | Orillia |
| Oakdale Child and Family Services Inc | Midhurst |
| Oakley Park Public School | Barrie |
| Oakview Craft Club | Wasaga Beach |
| Oasis of Hope | Barrie |
| Oddfellows and Rebekahs, Bracebridge, Humanitarian Service Committee | Bracebridge |
| Off the Wall Indoor Rock Climbing Centre | Barrie |
| Office of the Ombudsman of Ontario | Toronto |
| Office of the Worker Adviser, Barrie Consultations | Barrie |
| Ogemawahj Tribal Council | Rama |
| Okinawa Budo Karate Dojo, Lafontaine Ryusyokai, Okinawa Goju-ryu | Lafontaine |
| Old Duntroon School House Euchre | Clearview |
| Old Town Hall | Oro-Medonte |
| Olea Health | Wasaga Beach |
| Olupona [Dr S] | Orillia |
| OmbudService for Life and Health Insurance | Toronto |
| Ombudsman for Banking Services and Investments | Toronto |
| On T.R.A.C. for BULLYING PREVENTION, The Raising Awareness Centre for Bullying Prevention | Midland |
| Once Upon a Child | Barrie |
| One Parent Families Association of Canada. Newmarket Chapter | Newmarket |
| One Parent Families Association of Canada. Pickering | Pickering |
| One Roof. North Simcoe | Midland |
| One Sight | Barrie |
| One To Another | Barrie |
| One-Stop Access to Developmental Services | Barrie |
| Only Green | Midland |
| Onstage Performance Group | Barrie |
| Ontario, Ministry of Community Safety and Correctional Services, Central North Correctional Centre | Penetanguishene |
| Ontario Aboriginal Housing Services, Rural and Native Housing Program, Barrie Portfolio | Sault Ste Marie |
| Ontario Addiction Treatment Centres, Barrie Clinic | Barrie |
| Ontario Against Drunk Driving | Orillia |
| Ontario Agency for Health Protection and Promotion. Public Health Laboratory Orillia | Orillia |
| Ontario Alliance of Career Development Practitioners, Simcoe County Chapter | Simcoe County |
| Ontario Association for Marriage and Family Therapy | Tottenham |
| Ontario Bilkey ADHD Clinics | Barrie |
| Ontario Block Parent® Program. Barrie | Barrie |
| Ontario Block Parent® Program. Collingwood | Collingwood |
| Ontario Block Parent® Program. Orillia | Orillia |
| Ontario Brain Injury Association | Thorold |
| Ontario Clean Water Agency. Coldwater Plant | Coldwater |
| Ontario Criminal Injuries Compensation Board | Toronto |
| Ontario Early Years Centre, Barrie-Simcoe-Bradford, Barrie, Victoria Village | Barrie |
| Ontario Early Years Centre, Barrie-Simcoe-Bradford, Bradford Satellite | Bradford |
| Ontario Early Years Centre. Simcoe North, Emergency Baby Needs Depot. Midland | Midland |
| Ontario Early Years Centre. Simcoe North, Grandparents Parenting Again. Midland & Orillia | Midland |
| Ontario Early Years Centre. Simcoe North, Home Daycare Resource and Referral | Midland |
| Ontario Early Years Centre. Simcoe North, Midland Centre | Midland |
| Ontario Early Years Centre. Simcoe North, Midland Stay and Play Program | Midland |
| Ontario Early Years Centre. Simcoe North, Orillia Centre | Orillia |
| Ontario Early Years Centre. Simcoe North, Orillia Emergency Baby Needs Depot | Orillia |
| Ontario Early Years Centre. Simcoe North, Orillia Stay and Play Program | Orillia |
| Ontario Early Years Centre. Simcoe North, Parent Child Mother Goose | Midland |
| Ontario Early Years Centre. Simcoe North, Port McNicoll Play Group | Port McNicoll |
| Ontario Early Years Centre. Simcoe North, Saturday Morning with Dad | Midland |
| Ontario Early Years Centre. Simcoe North, Victoria Harbour Outreach Program | Victoria Harbour |
| Ontario Early Years Centre. Simcoe North, Washago Stay and Play Program | Orillia |
| Ontario Early Years Centre. Simcoe North, Waubaushene Outreach Program | Waubaushene |
| Ontario Early Years Centre. Simcoe-Grey. Alliston | Alliston |
| Ontario Early Years Centre. Simcoe-Grey. Collingwood | Collingwood |
| Ontario Educational Leadership Centre. Centre d'Animation Scolaire de L'Ontario | Ramara |
| Ontario Energy Board | Toronto |
| Ontario English Catholic Teachers Association. Unit Simcoe/Muskoka | Elmvale |
| Ontario Federation for Cerebral Palsy, Programs,Services, Donation Pick-up | Toronto |
| Ontario Federation of Snowmobile Clubs | Barrie |
| Ontario Federation of Snowmobile Clubs District 8, Mid-Ontario Snowmobile Clubs | Simcoe County |
| Ontario Genealogical Society, Simcoe County Branch | Barrie |
| Ontario Health Card Renewal Location. North Simcoe, North Simcoe Sports and Recreation Centre | Midland |
| Ontario Health Insurance Plan (OHIP) | London |
| Ontario Hooking Craft Guild. Huronia Branch | Simcoe County |
| Ontario Interpreting Services, After Hours Emergency Interpreting Service | Toronto |
| Ontario Laser Health & Rehabilitation Centre | Barrie |
| Ontario Liberal Party, Barrie Provincial Liberal Association | Barrie |
| Ontario March of Dimes, Befriending Program | Simcoe County |
| Ontario March of Dimes, Central Region, Acquired Brain Injury Services, Outreach Activity Groups in Simcoe County | Barrie |
| Ontario March of Dimes. West Central Region - Barrie | Barrie |
| Ontario March of Dimes. West Central Region - Barrie, Assistive Devices Program/Environmental Aids | Barrie |
| Ontario March of Dimes. West Central Region - Barrie, Barrie Friendship Group | Barrie |
| Ontario March of Dimes. West Central Region - Barrie, DesignAbility | Barrie |
| Ontario March of Dimes. West Central Region - Barrie, Summer Holiday Program | Barrie |
| Ontario Medical Imaging. Midland | Midland |
| Ontario Medical Imaging. Orillia | Orillia |
| Ontario Medical Imaging. Orillia, Ontario Breast Screening Program | Orillia |
| Ontario Motor Vehicle Industry Council | North York |
| Ontario Northland/Greyhound | Orillia |
| Ontario Nurses Association. Orillia Regional Office | Orillia |
| Ontario Osteoporosis Strategy | Toronto |
| Ontario Poison Centre | Toronto |
| Ontario Provincial Police. Central Region. Barrie Detachment | Barrie |
| Ontario Provincial Police. Collingwood and The Blue Mountains Detachment. Collingwood Location | Collingwood |
| Ontario Provincial Police. Huronia West Detachment | Wasaga Beach |
| Ontario Provincial Police. Nottawasaga Detachment | Alliston |
| Ontario Provincial Police. Orillia Detachment | Orillia |
| Ontario Provincial Police. Seniors Assistance Team | Orillia |
| Ontario Provincial Police. Southern Georgian Bay Detachment | Midland |
| Ontario Psychological Association, Psychologists Referral Service | Toronto |
| Ontario Public Service Employees Union | Orillia |
| Ontario Registered Music Teachers Association. Barrie Branch | Barrie |
| Ontario Retirement Communities Association | Oakville |
| Ontario Security Systems | Orillia |
| Ontario Self Help Network (The), Barrie-Simcoe Branch | Barrie |
| Ontario Seniors' Secretariat, Seniors' INFOline | Toronto |
| Ontario Seventh Step Society | Bradford |
| Ontario Sheep Marketing Agency District 6 | Simcoe County |
| Ontario Society for the Prevention of Cruelty to Animals, Midland and District, Carver Off-Leash Dog Park | Port McNicoll |
| Ontario Society for the Prevention of Cruelty to Animals, Wildlife Rehabilitation Centre | Port McNicoll |
| Ontario Society for the Prevention of Cruelty to Animals. Barrie Branch | Barrie |
| Ontario Society for the Prevention of Cruelty to Animals. Midland and District, Domestic Shelter and Adoption Centre | Midland |
| Ontario Society for the Prevention of Cruelty to Animals. Orillia Branch | Orillia |
| Ontario Trails Council | Kingston |
| Ontario Wheelchair Access & Mobility Equipment Inc | Orillia |
| Ontario Women's Directorate | Midhurst |
| Ontario Youth Apprenticeship Program, Simcoe County District School Board | Barrie |
| Ontario Youth Apprenticeship Program, Simcoe Muskoka Catholic District School Board | Barrie |
| Ontario's Lake Country Tourism Marketing Board | Orillia |
| Ontario. Ministry of the Attorney General, Office for Victims of Crime | Toronto |
| Ontario. Elections Ontario, Office of The Chief Electoral Officer of Ontario | Toronto |
| Ontario. Employment Ontario, Apprenticeship Office, Barrie Regional Office | Barrie |
| Ontario. Legislative Offices, Premier Dalton McGuinty, Liberal Party of Ontario Leader | Toronto |
| Ontario. Legislative Offices. Barrie, Member of Provincial Parliament, Carroll, Aileen (Lib) | Barrie |
| Ontario. Legislative Offices. Simcoe North. Midland Office, Member of Provincial Parliament, Dunlop, Garfield (Cons) | Midland |
| Ontario. Legislative Offices. Simcoe North. Orillia Office, Member of Provincial Parliament, Dunlop, Garfield (Cons) | Orillia |
| Ontario. Legislative Offices. Simcoe-Grey. Alliston Office, Member of Provincial Parliament, Wilson, Jim (PC) | Alliston |
| Ontario. Legislative Offices. Simcoe-Grey. Collingwood Office, Member of Provincial Parliament, Wilson, Jim, (Cons) | Collingwood |
| Ontario. Ministry of Agriculture Food and Rural Affairs. Central Region | Midhurst |
| Ontario. Ministry of Children and Youth Services, Central East Region, Barrie Office, Special Services at Home and Assistance for Children with Severe Disabilities | Barrie |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Barrie Office | Barrie |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Collingwood Reporting Office | Collingwood |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Midland Reporting Office | Midland |
| Ontario. Ministry of Children and Youth Services, Youth Justice Services, Orillia Office | Orillia |
| Ontario. Ministry of Children and Youth Services. Adoption Disclosure, Central Services, Adoption Disclosure Register | Toronto |
| Ontario. Ministry of Children and Youth Services. Central East Region. Barrie Office, Community Programs Unit, Licensing Services | Barrie |
| Ontario. Ministry of Children and Youth Services. Central East Region. Newmarket Office, Community Programs Unit, Child Care Information | Newmarket |
| Ontario. Ministry of Citizenship and Immigration. Central Area. Midhurst Office | Midhurst |
| Ontario. Ministry of Community and Social Services, Family Responsibility Office | Toronto |
| Ontario. Ministry of Community and Social Services, Passport Initiative | Barrie |
| Ontario. Ministry of Community and Social Services. Central East Region. Barrie Office | Barrie |
| Ontario. Ministry of Community and Social Services. Central East Region. Barrie Office, Income and Employment Supports, Community Start-Up and Maintenance Benefit | Barrie |
| Ontario. Ministry of Community and Social Services. Central East Region. Barrie Office, Income and Employment Supports, Ontario Disability Support Program | Barrie |
| Ontario. Ministry of Community and Social Services. Central East Region. Barrie Office, Ontario Disability Support Program, Employment Start-Up Benefit | Barrie |
| Ontario. Ministry of Community and Social Services. Central East Region. Barrie Office, Ontario Disability Support Program, Employment Supports | Barrie |
| Ontario. Ministry of Community and Social Services. Orillia Office, Income and Employment Supports, Community Start-Up Benefit | Orillia |
| Ontario. Ministry of Community and Social Services. Orillia Office, Income and Employment Supports, Employment Start-Up Benefit | Orillia |
| Ontario. Ministry of Community and Social Services. Orillia Office, Income and Employment Supports, Employment Supports | Orillia |
| Ontario. Ministry of Community and Social Services. Orillia Office, Income and Employment Supports, Ontario Disability Support Program | Orillia |
| Ontario. Ministry of Community and Social Services. Social Assistance Programs, Social Benefits Tribunal | Toronto |
| Ontario. Ministry of Community Safety and Correctional Services, Barrie Office, Probation and Parole Services | Barrie |
| Ontario. Ministry of Community Safety and Correctional Services. Alliston Office, Probation and Parole Services | Alliston |
| Ontario. Ministry of Community Safety and Correctional Services. Collingwood Office, Probation and Parole Services, Adults | Collingwood |
| Ontario. Ministry of Community Safety and Correctional Services. Midland, Probation and Parole Services. Adult | Midland |
| Ontario. Ministry of Community Safety and Correctional Services. Ontario Provincial Police. General Headquarters and Central Region. Orillia | Orillia |
| Ontario. Ministry of Community Safety and Correctional Services. Orillia Office, Probation and Parole Services, Adults | 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. Central Area. Midhurst Office | Midhurst |
| Ontario. Ministry of Economic Development and Trade, Simcoe Muskoka Office | Midhurst |
| 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, ServiceOntario, Central Services Division, Central Production and Verification Services Branch, Land Registry Office #51 | Barrie |
| Ontario. Ministry of Government Services. Office of the Registrar General | Toronto |
| Ontario. Ministry of Health and Long-Term Care, Assistive Devices Program | Toronto |
| 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 Health Insurance Plan, Barrie Information Office | Barrie |
| 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, Your Health Care Options | Ontario |
| Ontario. Ministry of Health Promotion. Central Area. Midhurst Office | Midhurst |
| Ontario. Ministry of Labour | Ontario |
| Ontario. Ministry of Natural Resources, Ontario Parks, MacGregor Point Provincial Park | Port Elgin |
| 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. Aurora District Office, Holland Marsh Provincial Wildlife Management Area | Bradford West Gwillimbury |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Region, Waubaushene Beaches Provincial Nature Reserve | Tay |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Region., Six Mile Lake Provincial Park | Muskoka District |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Zone, Awenda Provincial Park | Tiny |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Zone, Mara Provincial Park | Orillia |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Zone, Noisy River Provincial Nature Reserve | Wasaga Beach |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Zone, Nottawasaga Lookout Provincial Nature Reserve | Clearview |
| Ontario. Ministry of Natural Resources. Ontario Parks. Central Zone, Springwater Provincial Park | Midhurst |
| Ontario. Ministry of Natural Resources. Ontario Parks. Midhurst District Office, Devil's Glen Provincial Park | Clearview |
| Ontario. Ministry of Natural Resources. Ontario Parks. Midhurst District Office, Nancy Island Historic Site | Wasaga Beach |
| Ontario. Ministry of Natural Resources. Ontario Parks. Midhurst District Office, Wasaga Beach Provincial Park | Wasaga Beach |
| Ontario. Ministry of Natural Resources. Ontario Parks. Southern Region, Bass Lake Provincial Park | Oro-Medonte |
| Ontario. Ministry of Natural Resources. Ontario Parks. Southern Region, McRae Point Provincial Park | Ramara |
| Ontario. Ministry of Natural Resources. Ontario Parks. Southwest Zone, Earl Rowe Provincial Park | Alliston |
| Ontario. Ministry of Natural Resources. Southern Region. Midhurst District Office | Midhurst |
| Ontario. Ministry of Natural Resources. Southern Region. Midhurst District Office, Ontario Hunter Education Program | Midhurst |
| Ontario. Ministry of Natural Resources. Southern Region. Midhurst District Office. Copeland Forest | Midhurst |
| 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. Whitby Tax Office. Client Accounts and Services Branch | Whitby |
| Ontario. Ministry of the Attorney General, Barrie Office, Crown Attorney | Barrie |
| Ontario. Ministry of the Attorney General, Barrie Office, Justice of the Peace. Criminal Matters | Barrie |
| Ontario. Ministry of the Attorney General, Justice Ontario | Toronto |
| Ontario. Ministry of the Attorney General, Ontario Victim Services Secretariat, Victim/Witness Assistance Program, Simcoe County | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Court Support | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Enforcement and Finance, Sheriff's Office | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Family Law Information Centre | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Ontario Court of Justice, Criminal | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Ontario Superior Court of Justice, Civil Filing Office | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Ontario Superior Court of Justice, Estates Administration | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Ontario Superior Court of Justice, Family Court | Barrie |
| Ontario. Ministry of the Attorney General. Barrie Office, Ontario Superior Court of Justice, Small Claims Court | Barrie |
| Ontario. Ministry of the Attorney General. Bradford Satellite Court, Ontario Court of Justice | Bradford |
| Ontario. Ministry of the Attorney General. Children's Lawyer | Toronto |
| Ontario. Ministry of the Attorney General. Collingwood Satellite Court, Ontario Court of Justice | Collingwood |
| Ontario. Ministry of the Attorney General. Courts Administration Division. Orillia | Orillia |
| Ontario. Ministry of the Attorney General. Midland Satellite Court, Ontario Court of Justice | Midland |
| Ontario. Ministry of the Attorney General. Office of the Public Guardian and Trustee | Toronto |
| Ontario. Ministry of the Attorney General. Orillia Office, Family Law Information Centre | Orillia |
| Ontario. Ministry of the Attorney General. Superior Court, Orillia Small Claims Court | Orillia |
| Ontario. Ministry of the Attorney General. Toronto, Ontario Victim Services Secretariat, Victim Support Line | Toronto |
| Ontario. Ministry of the Environment, Barrie Office | Barrie |
| Ontario. Ministry of the Environment, Barrie Office, Safe Drinking Water Branch | Barrie |
| Ontario. Ministry of Tourism | Toronto |
| Ontario. Ministry of Tourism, Tourism Marketing Partnership Corporation, Ontario Travel Information Centre | Barrie |
| Ontario. Ministry of Tourism and Culture. Central Area. Midhurst Office | Midhurst |
| Ontario. Ministry of Training, Colleges and Universities, Employment Ontario, Labour Market Information | Toronto |
| Ontario. Ministry of Training, Colleges and Universities, Student Support Branch | Thunder Bay |
| Ontario. Ministry of Transportation | Toronto |
| Ontario. Ministry of Transportation, Driver and Vehicle Licence Issuing Office, Barrie, Bayfield Street Location | Barrie |
| Ontario. Ministry of Transportation, Driver and Vehicle Licence Issuing Office, Barrie, Burton Avenue Location | Barrie |
| Ontario. Ministry of Transportation, Southwestern Region, Senior Driver Renewal Program, Senior Driver Group Education Sessions | Barrie |
| Ontario. Ministry of Transportation. Alliston Office, Drivers and Vehicle Licence Office | Alliston |
| Ontario. Ministry of Transportation. Bradford Office, Drivers and Vehicle Licence Office | Bradford West Gwillimbury |
| Ontario. Ministry of Transportation. Central Region, International Registration | Barrie |
| Ontario. Ministry of Transportation. Customer Service Office, Road Conditions/Construction Information Service | St Catharines |
| Ontario. Ministry of Transportation. Orillia, Driver and Vehicle Licensing Agents | Orillia |
| Ontario. Seniors' Secretariat, Midhurst | Midhurst |
| Ontario. Service Ontario Counter, Stayner Location | Stayner |
| Ontario. ServiceOntario Counter, Collingwood Location | Collingwood |
| Ontario. ServiceOntario Kiosks. Barrie Location | Barrie |
| Ontario. ServiceOntario Kiosks. Newmarket Location | Newmarket |
| Ontario. ServiceOntario. Government Information Centre. Barrie Location | Barrie |
| Open Arms Early Childhood Centre, Child Care Program | Barrie |
| Open Arms Early Childhood Centre, Nursery School Program | Barrie |
| Opening Closets: Creating Community Together | Simcoe County |
| Operation Christmas Child | Orillia |
| Operation Christmas Child. Wasaga Beach | Wasaga Beach |
| OPP Museum | Orillia |
| Optimist Beginner Golf League | Barrie |
| Optimist Club of Barrie Inc | Barrie |
| Optimum Childcare Nannies and Senior Care Givers Inc | Vancouver |
| Optimum Potential Chiropractic and Nutrition | Orillia |
| Optometrist Office | Bracebridge |
| Orchard Park Public School | Orillia |
| Order of the Eastern Star Lily of the Valley Chapter 141. Orillia | Orillia |
| Order of The Eastern Star. Alliston Five Star Chapter 269 | Alliston |
| Order of The Eastern Star. Barrie Bayview Chapter 105 | Barrie |
| Order of The Eastern Star. Chapter # 240. Midland | Midland |
| Order of The Eastern Star. Cookstown Pinecrest Chapter 263 | Cookstown |
| Order of The Eastern Star. Innisfil Chapter 162 | Stroud |
| Organic Fruits and Vegetables | Penetanguishene |
| Orillia & Area Physician Recruitment and Retention Committee | Orillia |
| Orillia 6th Division Flyers | Ramara |
| Orillia Accident Reporting Centre | Orillia |
| Orillia After Hours Clinic | Orillia |
| Orillia Alliance Church | Orillia |
| Orillia Alternative School for Independent Studies | Orillia |
| Orillia Amateur Radio Club (The) | Orillia |
| Orillia and District Adult Bowler's Association | Orillia |
| Orillia and District Agricultural Society | Orillia |
| Orillia and District Arts Council | Orillia |
| Orillia And District Association of Churches | Orillia |
| Orillia and District Camera Club | Orillia |
| Orillia and District Canadian Club (The) | Orillia |
| Orillia and District Construction Association | Orillia |
| Orillia and District Literacy Council Inc | Orillia |
| Orillia and District Literacy Council Inc, Literacy and Basic Skills | Orillia |
| Orillia and District Mens Dart League | Orillia |
| Orillia and District Raging Grannies | Orillia |
| Orillia and District Real Estate Board | Orillia |
| Orillia and District Snowmobile Club | Orillia |
| Orillia and District Soccer Club | Orillia |
| Orillia and District Veterinary Services | Coldwater |
| Orillia Audiology Clinic | Orillia |
| Orillia Badminton Club | Orillia |
| Orillia Baptist Church | Orillia |
| Orillia Business Association | Orillia |
| Orillia Business Womens Association | Orillia |
| Orillia Canada Day | Orillia |
| Orillia Carpet Bowlers | Orillia |
| Orillia Central Preschool | Orillia |
| Orillia Channel Cats Swim Club | Orillia |
| Orillia Charity Bingo | Orillia |
| Orillia Chiropractic Office, Shaughnessy [Dr M] | Orillia |
| Orillia Christian Home Educators | Orillia |
| Orillia Christian School | Orillia |
| Orillia Citizens on Patrol | Orillia |
| Orillia Common Roof, Social Enterprise | Orillia |
| Orillia Community Church | Orillia |
| Orillia Community Nonprofit Housing Corporation | Orillia |
| Orillia Community Policing Committee | Orillia |
| Orillia Concert Association | Orillia |
| Orillia Curling Club | Orillia |
| Orillia Dental Association | Orillia |
| Orillia Depression Anxiety and Manic Depression Self Help Group | Orillia |
| Orillia District Chamber of Commerce | Orillia |
| Orillia District Chamber of Commerce, Perch Festival | Orillia |
| Orillia District Chamber of Commerce, Port of Orillia | Orillia |
| Orillia District Collegiate Vocational Institute | Orillia |
| Orillia District Disability Recovery Group | Orillia |
| Orillia Duplicate Bridge Club | Orillia |
| Orillia Eyewear | Orillia |
| Orillia Fall Fair | Orillia |
| Orillia Farmers Market | Orillia |
| Orillia Fertility Associates | Orillia |
| Orillia Figure Skating Club | Orillia |
| Orillia Fine Arts Association | Orillia |
| Orillia Fire Department | Orillia |
| Orillia First Aid and Safety Training | Orillia |
| Orillia Fish and Game Conservation Club | Orillia |
| Orillia Folk Society | Orillia |
| Orillia Girls Hockey Association | Orillia |
| Orillia Grief Resource Network | Orillia |
| Orillia Guild of Artists and Artisans | Orillia |
| Orillia Gun Club Inc | Severn |
| Orillia Heritage Centre Corporation | Orillia |
| Orillia Horticultural Society | Orillia |
| Orillia Housing Resource Centre | Orillia |
| Orillia Hypnosis | Orillia |
| Orillia Independent Living, Apartments for Seniors | Orillia |
| Orillia Jazz Festival | Orillia |
| Orillia Kids of Steel Triathlon | Orillia |
| Orillia Kinsmen Club | Orillia |
| Orillia Kiwanis Music Festival | Orillia |
| Orillia Kumon Centre | Orillia |
| Orillia Ladies Slo Pitch Youth League | Orillia |
| Orillia Ladies Soccer Club | Orillia |
| Orillia Law Association | Orillia |
| Orillia Lawn Bowling Club | Orillia |
| Orillia Legion Athletic Club | Orillia |
| Orillia Legion Minor Baseball Inc. | Orillia |
| Orillia Life Centre (The) | Orillia |
| Orillia Lions Club | Orillia |
| Orillia Lodge 192 | Orillia |
| Orillia Manufacturers Association | Orillia |
| Orillia Men's and Ladies Slo-Pitch | Orillia |
| Orillia Miniature Club | Orillia |
| Orillia Minor Hockey Association | Orillia |
| Orillia Minor Lacrosse Association | Orillia |
| Orillia Museum of Art and History (The) | Orillia |
| Orillia Native Womens Group | Orillia |
| Orillia Natural Health | Orillia |
| Orillia Naturalists Club | Orillia |
| Orillia Newcomers Club | Orillia |
| Orillia Opera House | Orillia |
| Orillia Packet and Times, Sun Media Group LP | Orillia |
| Orillia Paediatric Teaching Associates, Hudak [Dr], Gordon [Dr], Smith [Dr], Meeder [Dr] | Orillia |
| Orillia Pharmacy Ltd | Orillia |
| Orillia Power and Sail Squadron | Orillia |
| Orillia Pregnancy Resource Centre | Orillia |
| Orillia Prep School | Orillia |
| Orillia Prostate Cancer Awareness Group | Orillia |
| Orillia Public Library | Orillia |
| Orillia Quilter's Guild | Orillia |
| Orillia Racing Pigeon Club | Orillia |
| Orillia Rowing Club | Orillia |
| Orillia Soldiers Memorial Hospital, Children's Therapy Services. Occupational Therapy, Physiotherapy and Social Work Midland | Midland |
| Orillia Soldiers' Memorial Hospital | Orillia |
| Orillia Soldiers' Memorial Hospital, Community Mental Health Service | Orillia |
| Orillia Soldiers' Memorial Hospital, Geriatric / Senior Assessments | Orillia |
| Orillia Soldiers' Memorial Hospital, Geriatric Day Hospital | Orillia |
| Orillia Soldiers' Memorial Hospital, Phase II Cardiac Rehabilitation Program | Orillia |
| Orillia Soldiers' Memorial Hospital, Pulmonary Rehabilitation Program | Orillia |
| Orillia Soldiers' Memorial Hospital, Speech Language Pathology | Orillia |
| Orillia Soldiers' Memorial Hospital, Volunteer Services | Orillia |
| Orillia Soldiers' Memorial Hospital Foundation | Orillia |
| Orillia Soldiers' Memorial Hospital, Child Development Services | Orillia |
| Orillia Soldiers' Memorial Hospital, Regional Sexual and Domestic Assault Treatment Centre, Domestic Assault Program | Orillia |
| Orillia Soldiers' Memorial Hospital, Regional Sexual and Domestic Assault Treatment Centre, Sexual Assault Program | Orillia |
| Orillia Soldiers' Memorial Hospital. Chiropody | Orillia |
| Orillia Soldiers' Memorial Hospital. Diabetes Education Centre | Orillia |
| Orillia Soldiers' Memorial Hospital. Diabetes Education Centre. Inpatient/Outpatient Pediatric Diabetes Education Program | Orillia |
| Orillia Square Mall, Mall Walking Program | Orillia |
| Orillia Sunshine Rug Hookers | Orillia |
| Orillia Trails For Life Committee | Orillia |
| Orillia Transit | Orillia |
| Orillia Tutoring Services | Orillia |
| Orillia Urology Associates, Sing [Dr R], Okafo [Dr B] | Orillia |
| Orillia Wind Ensemble | Orillia |
| Orillia Winter Carnival | Orillia |
| Orillia Women's Recreational Hockey | Orillia |
| Orillia Works | Orillia |
| Orillia X-Ray and Ultrasound Inc | Orillia |
| Orillia Youth Basketball Association, Orillia Lakers, House League Basketball, Rep. Teams | Orillia |
| Orillia Youth Centre, Orillia Youth Opportunities Committee | Orillia |
| Orillia Youth Symphony Orchestra | Orillia |
| Orillia, City of | Orillia |
| Orillia, City of. Economic Development Committee | Orillia |
| Orillia, City of. Mayor's Office | Orillia |
| Orillia, City of. Orillia Wheelchair Limousine Service | Orillia |
| Orillia, City of. Parks and Recreation Department | Orillia |
| Orillia, City of. Parks and Recreation Department. Brian Orser Arena | Orillia |
| Orillia, City of. Parks and Recreation. Orillia Community Centre | Orillia |
| Orillia, City of. Public Works Department. Pollution Control Division | Orillia |
| Orillia, City of. Public Works Department. Solid Waste Management Division | Orillia |
| Orillia, City of. Ward 1. Councillor Joe Fecht | Orillia |
| Orillia, City of. Ward 1. Councillor Wayne Gardy | Orillia |
| Orillia, City of. Ward 2. Councillor Maurice McMillan | Orillia |
| Orillia, City of. Ward 2. Councillor Ralph Cipolla | Orillia |
| Orillia, City of. Ward 3. Councillor Michael Fogarty | Orillia |
| Orillia, City of. Ward 3. Councillor Paul Spears | Orillia |
| Orillia, City of. Ward 4. Councillor Don Evans | Orillia |
| Orillia, City of. Ward 4. Councillor Tim Lauer | Orillia |
| Oro African Church | Oro-Medonte |
| Oro Agricultural Society | Oro-Medonte |
| Oro District Lioness Club | Oro-Medonte |
| Oro District Lions Club | Oro Station |
| Oro Minor Hockey Association | Oro-Medonte |
| Oro Station Playschool | Oro Station |
| Oro-Medonte Adult Skating Club | Oro-Medonte |
| Oro-Medonte Chamber of Commerce | Oro-Medonte |
| Oro-Medonte History Association | Oro-Medonte |
| Oro-Medonte Horticultural Society | Oro-Medonte |
| Oro-Medonte Lake Country RailTrail | Oro-Medonte |
| Oro-Medonte Mens Recreational Slo-Pitch League | Oro-Medonte |
| Oro-Medonte Minor Ball Association | Oro-Medonte |
| Oro-Medonte Minor Soccer | Oro-Medonte |
| Oro-Medonte Skating Club | Oro Station |
| Oro-Medonte Township. Community Arena | Oro-Medonte |
| Oro-Medonte Township. Municipal Office | Oro-Medonte |
| Orr Lake Acres | Elmvale |
| Orr Lake Golf Club | Elmvale |
| Orr Lake Ratepayers Association | Springwater |
| Orthotics Specialties | Barrie |
| Osteoporosis Canada, Simcoe Muskoka | Stayner |
| Our Elders Retirement Home | Stayner |
| Our Lady of Grace Roman Catholic Parish | Angus |
| Our Lady of Grace School | Angus |
| Our Lady of Lourdes Elementary School. Elmvale | Elmvale |
| Our Lady of Lourdes Roman Catholic Church. Elmvale | Elmvale |
| Our Lady of the Assumption Church | Clearview |
| Our Lady of the Assumption Elementary School | Clearview |
| Our Ramara FunFest | Ramara |
| Our Town Food Bank. Tottenham | Tottenham |
| Out of the Cold - Midland | Midland |
| Outdoor Performance Centre Association | Barrie |
| Over Thirty Hockey League. Midland | Midland |
| Overeaters Anonymous, Barrie Group | Barrie |
| Overeaters Anonymous. Midland | Midland |
| Overeaters Anonymous. Orillia | Orillia |
| Overeaters Anonymous. Wasaga Beach | Wasaga Beach |
| Oxfam Canada, Ontario Region | Toronto |
| Oxford Learning Centre, Barrie South | Barrie |
| Oxford Learning Centre. Barrie North | Barrie |
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