| Organization Name(s) | Located In |
| Abbott Laboratories. Ensure Consumer Relations | Montréal |
| A Farber and Partners Inc. Collingwood Sub Office | Collingwood |
| A Healthy You - Fitness and Nutrition Centre | Wasaga Beach |
| A New Look Optical | Alliston |
| A Step Ahead Foot Clinic | Orillia |
| A-Television Barrie | Barrie |
| A. Farber and Partners. Alliston Satellite Office | Alliston |
| A. Farber and Partners. Midland Satellite Office | Midland |
| ABACUS Help for Parents, Listing of Ontario Autism ABA Providers | Toronto |
| Abbott Foot and Ankle Clinic | Collingwood |
| Ability Online | Etobicoke |
| Able Taxi | Orillia |
| Aboriginal Human Resource Council | Saskatoon |
| Above & Beyond Learning Experience | Alliston |
| Abuse Recovery Counselling Services | Barrie |
| Academy of Learning. Barrie, Computer and Business Career College | Barrie |
| Access 2 Entertainment Card | Toronto |
| Achill Choral Society | Adjala-Tosorontio |
| Achimota Centre for Children with Autism | Barrie |
| Active Healthcare Centre | Wasaga Beach |
| Acupuncture Clinic, A Balanced Path, Natural Health Services | Midland |
| Acupuncturist. Heffer, Karin | Midland |
| Ad Astral Place | Barrie |
| Adam Martynuik DC - Chiropractor | Springwater |
| Adams Chiropractic and Wellness Centre | Stayner |
| Adjala Central Public School | Loretto |
| Adjala United Church | Loretto |
| Adjala, Tecumseth and West Gwillimbury Conservation Club | Alliston |
| Adjala-Tosorontio Municipal Ball Program | Loretto |
| Adjala-Tosorontio Residents Association | Adjala-Tosorontio |
| Adjala-Tosorontio, Township of. Building Department | Alliston |
| Adjala-Tosorontio, Township of. By-Law Enforcement Department, Canine Control Unit | Alliston |
| Adjala-Tosorontio, Township of. Clerk's Department | Alliston |
| Adjala-Tosorontio, Township of. Fire Service | Alliston |
| Adjala-Tosorontio, Township of. Planning Department | Alliston |
| Adjala-Tosorontio, Township of. Public Works Department | Alliston |
| AdminDesk | Simcoe County |
| Admiral Collingwood Elementary School | Collingwood |
| Adult Children of Alcoholics. Collingwood Branch | Collingwood |
| Adult Learning Centre (The), Collingwood Campus | Collingwood |
| Adult Learning Centres Grey-Bruce-Georgian, Georgian Literacy | Collingwood |
| Advanced Foot and Orthotic Clinic | Midland |
| Advanced Hypnosis Centre of Collingwood | Collingwood |
| Advocacy Centre For The Elderly | Toronto |
| Advocis, Simcoe-Muskoka Chapter | Barrie |
| Afternoon Friendship Club | Barrie |
| Aggarwal [Dr R K], Kennedy [Dr K M] | Orillia |
| AGL French Translation Service | Barrie |
| Agricultural Society. Coachmen Club | Orillia |
| AIDS Committee of Simcoe County, Barrie Office | Barrie |
| AIDS Committee of Simcoe County, Orillia Satellite Office | Orillia |
| Air Force Association of Canada, RCAF 441 (Huronia) Wing | Barrie |
| Al-Anon. Angus. Love and Hope Group | Angus |
| Al-Anon. Barrie | Barrie |
| Al-Anon. Bradford. Journey to Freedom Group | Bradford West Gwillimbury |
| Al-Anon. Collingwood Branch | Collingwood |
| Al-Anon. Innisfil. Alcona Friendship Group | Innisfil |
| Al-Anon. North Simcoe, Midland Al-Anon Family Group, Serenity Al-Anon Family Group | Midland |
| Al-Anon. Orillia | Orillia |
| Al-Anon. Tottenham | Tottenham |
| Alateen. Barrie | Barrie |
| Alateen. Collingwood Branch | Collingwood |
| Alcohol and Gaming Commission of Ontario. Orillia Office | Orillia |
| Alcoholics Anonymous, Barrie | Barrie |
| Alcoholics Anonymous, Cookstown Group | Cookstown |
| Alcoholics Anonymous. Alcona Serenity Group | Stroud |
| Alcoholics Anonymous. Alliston Group | Alliston |
| Alcoholics Anonymous. Base Borden Group | Borden CFB |
| Alcoholics Anonymous. Bradford World Famous Group | Bradford West Gwillimbury |
| Alcoholics Anonymous. North Simcoe | Midland |
| Alcoholics Anonymous. Orillia Branch | Orillia |
| Alcoholics Anonymous. Tottenham Serenity Group | Tottenham |
| Alcona Beach Club Inc | Innisfil |
| Alcona Business Association | Innisfil |
| Alcona Chiropractic and Natural Health Clinic | Innisfil |
| Alcona Glen Elementary School | Innisfil |
| Alcona Seniors 285 | Innisfil |
| Alenbe Community Theatre | Alliston |
| Alexander [Dr David] | Orillia |
| Algonquin Provincial Park | Algonquin |
| Algonquin Ridge Elementary School | Barrie |
| All City Stage Band Project | Barrie |
| All Errand Services | Collingwood |
| All Nations Full Gospel Church. Barrie Branch | Barrie |
| All Round Health and Fitness | Barrie |
| All Saints Anglican Church. Penetanguishene | Penetanguishene |
| All Saints' Anglican Church. Collingwood | Collingwood |
| All That's Dance and more | Barrie |
| All-Cut Lawn Care | Collingwood |
| Allandale Heights Public School | Barrie |
| Allanview Place After School Program | Barrie |
| Allanview Stay and Play Group | Barrie |
| Alliance for Equality of Blind Canadians. South Georgian Bay Chapter | Collingwood |
| Alliston Alliance Church | Alliston |
| Alliston and Area Christian Women's Club | Alliston |
| Alliston and District Chamber of Commerce | Alliston |
| Alliston and District Horticultural Society | Alliston |
| Alliston and District Humane Society | Beeton |
| Alliston and District Ministerial Association | Alliston |
| Alliston and District Snowmobile Club | Alliston |
| Alliston and District Sportsmen's Club | Alliston |
| Alliston Badminton Club | Alliston |
| Alliston Business Improvement Association | Alliston |
| Alliston Chiropractic and Wellness Centre (The) | Alliston |
| Alliston Christian Fellowship | Alliston |
| Alliston Christian Fellowship, Zoumi | Alliston |
| Alliston Christian Reformed Church | Alliston |
| Alliston Community Christian School | Alliston |
| Alliston Community Policing Committee | Alliston |
| Alliston Community Policing Youth Centre | Alliston |
| Alliston Curling Club | Alliston |
| Alliston Dental Group | Alliston |
| Alliston Denture Clinic | Alliston |
| Alliston Eye Centre | Alliston |
| Alliston Family Health Clinic | Alliston |
| Alliston Family Pharmacy | Alliston |
| Alliston Family Physicians | Alliston |
| Alliston Firefighters Association | Alliston |
| Alliston Historical Society | Alliston |
| Alliston Kumon Centre | Alliston |
| Alliston Ladies Slo Pitch League | Alliston |
| Alliston Lions Club | Alliston |
| Alliston Lions Club, Christmas Hamper Program | Alliston |
| Alliston Lions Club, Loan Cupboard | Alliston |
| Alliston Medical Imaging Centre | Alliston |
| Alliston Men's Dart League | Alliston |
| Alliston Minor Softball Association | Alliston |
| Alliston Mixed Slo Pitch League | New Tecumseth |
| Alliston Natural Therapy Centre., Jan Archer | Alliston |
| Alliston Nikolettes Gymnastics Club | Alliston |
| Alliston Pentecostal Church | Alliston |
| Alliston Physiotherapy and Sports Rehabilitation Clinic | Alliston |
| Alliston Skate Club | Alliston |
| Alliston Soccer Club | Alliston |
| Alliston Soccer Club, Adult | Alliston |
| Alliston Tennis Club | Alliston |
| Alliston Union Public School | Alliston |
| Alliston Walk-in Clinic | Alliston |
| Alpine Ontario Alpin | Collingwood |
| ALS Society of Ontario, Simcoe/York Region | Barrie |
| Alternative Learning Program for Students | Midland |
| Alzheimer Society Greater Simcoe County, North East Simcoe County, First Link | Simcoe County |
| Alzheimer Society North East Simcoe County | Orillia |
| Alzheimer Society North East Simcoe County, First Link Program | Orillia |
| Alzheimer Society of Greater Simcoe County | Barrie |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. Alliston Area | Alliston |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. Barrie Area | Barrie |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. Barrie Area, Adult Child Support Group | Barrie |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. Bradford Area | Bradford |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. North Simcoe | Penetanguishene |
| Alzheimer Society of Greater Simcoe County, Alzheimer Family Support Group. South Georgian Bay | Wasaga Beach |
| Alzheimer Society of Greater Simcoe County, Memory Loss Caregiver Support Group. Stroud Area | Barrie |
| Alzheimer Society of Greater Simcoe County, Safely Home Alzheimer Wandering Registry | Barrie |
| Am Shalom Synagogue | Barrie |
| Amnesty International. Barrie Action Circle | Barrie |
| Amnesty International. Orillia Group 10 | Orillia |
| Amundson [Dr] | Wasaga Beach |
| Amy Moroz Counselling Services | Barrie |
| Anaphylaxis Canada | Toronto |
| Andrew Hunter Elementary School | Barrie |
| Angel Gate Bingo Hall | Penetanguishene |
| Angel Wing Farms, Riding Instruction and Summer Day Camp Programs | Midland |
| Anglican Church of The Good Shepherd. Wyebridge | Wyebridge |
| Anglican Parish of Elmvale (The), Wycliffe Anglican Church, Elmvale, St. John's Anglican, Waverley, Anglican Church of the Good Shepherd, Wyebridge | Elmvale |
| Angus and District Lions Club | Angus |
| Angus and District Lions Club, Dart League | Angus |
| Angus Chiropractic Centre, De Beer [Dr Frank G] | Angus |
| Angus Cooperative Homes | Angus |
| Angus Family Medical Centre | Angus |
| Angus Food Bank Inc (The) | Angus |
| Angus Gardens Senior Citizens Complex | Angus |
| Angus Horticultural Society | Angus |
| Angus Mens Oldtimers Slo Pitch League | Angus |
| Angus Minor Baseball Association | Angus |
| Angus Morrison Elementary School | Angus |
| Angus United Church | Angus |
| Angus Zion Presbyterian Church | Angus |
| Anishinabek Police Services. Christian Island | Christian Island |
| Anten Mills Community Association | Springwater |
| Apetito | Barrie |
| Apothecary Shop (The) | Port Carling |
| Appleone Employment Services, Barrie Branch | Barrie |
| Appraisal Institute of Canada. Huronia Chapter | Newmarket |
| Arcade Jory's Pharmacy | Midland |
| Archer [Dr Robert] | Midland |
| Arches Orthotics | Severn |
| Ardtrea Cumberland Beach Public School. Ardtrea Site | Severn |
| Ardtrea Cumberland Beach Public School. Cumberland Beach Site | Severn |
| Ardtrea United Church | Severn |
| Area Productions | Innisfil |
| Arise Christian Academy | Oro-Medonte |
| Ark Animal Hospital | Orillia |
| Arlett van Rotterdam Partnership (AvR) | North York |
| Army Cadet League of Canada (Ontario). Creemore 1944 EME | Creemore |
| Army, Navy and Air Force Veterans in Canada, Barrie Unit 365 | Barrie |
| Army, Navy and Air Force Veterans in Canada, Barrie Unit 365, Ladies Auxiliary | Barrie |
| Army, Navy and Air Force Veterans in Canada. Orillia Unit 400 | Orillia |
| Around Again | Wasaga Beach |
| Arrowhead Provincial Park | Huntsville |
| Art Group of Collingwood | Collingwood |
| Art of Dance | Barrie |
| Art Psychotherapy and Verbal Counselling/Psychotherapy, Survivors of Sexual Assault, Male and Female, Addictions, Depression, Communication, Stress | Simcoe County |
| Art Psychotherapy Counselling Services | Bradford |
| Arthritis Society (The) | Orillia |
| Arthritis Society (The), Arthritis Self Management Program, South Georgian Bay | Collingwood |
| Arthritis Society (The). Ontario Division | Toronto |
| Arthritis Society's Bluebird Club (The). Barrie Branch | Barrie |
| Arthur [Dr Marion] | Collingwood |
| ARTWORK Gallery of Contemporary Art | Collingwood |
| Aschwanden [Sabine] | Bradford |
| Askennonia Senior Centre | Midland |
| Assikinack Public School | Barrie |
| Association for Bright Children | Simcoe County |
| Association of Administrative Assistants. Barrie / Simcoe County Branch | Simcoe County |
| Association of Parent Support Groups in Ontario Inc. | Toronto |
| Assured Response CPR & First Aid Training | Barrie |
| Atherley United Church | Orillia |
| Atlantic Challenge Canada | Midland |
| Atrium Foot Clinic | Barrie |
| Atrium Pharmacy | Barrie |
| Atrium Retirement Home (The) | Orillia |
| Audia Hearing Aid Centre | Orillia |
| Audia Hearing Aid Centre | Midland |
| Auger [Alisa] | Barrie |
| Augimeri [Dr John] | Midland |
| Autism Ontario, Simcoe County Chapter | Barrie |
| Autism Ontario, Simcoe County Chapter, Support Group for Parents of Children with Asperger Syndrome | Barrie |
| Avalon Orchards | Innisfil |
| Avalon Wellness Centre | Barrie |
| Avening United Church | Clearview |
| Avening Womens Institute (Simcoe West) | Clearview |
| Avidar [Dr D] | Penetanguishene |
| Awakenings - The Center for Better Living | Collingwood |
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