| AboutFace | North York West |
| Action Health Care, St Marys | St Marys |
| Action Health Care | Grand Bend |
| Action Health Care Inc., Stratford | Stratford |
| Ad Standards, Toronto | Toronto |
| Adoption Council of Ontario | Toronto |
| Adult Learning Programs of Perth, St Marys, Literacy and Basic Skills | St Marys |
| Adult Learning Programs of Perth, Stratford, Literacy and Basic Skills | Stratford |
| Advocacy Centre for Tenants Ontario | Toronto |
| Advocacy Centre for the Elderly | Toronto |
| Aktion Club, Stratford Branch | Stratford |
| Al-Anon / Alateen Family Groups, No Physical Address | Stratford |
| Alcohol and Gaming Commission of Ontario | Toronto |
| Alcoholics Anonymous, Stratford and Perth County Meetings | Stratford |
| Alert Ready - Emergency Alert System | |
| Alzheimer Society Huron Perth, Community Education Programs, Mailing Address Only | Central Huron |
| Alzheimer Society Huron Perth, Minds in Motion, Stratford Office | Stratford |
| Alzheimer Society Huron Perth, North Perth Satellite Office - Listowel, First Link, Alzheimer Society Huron Perth | North Perth |
| Alzheimer Society Huron Perth, St Marys Satellite Location, First Link, Alzheimer Society Huron Perth | St Marys |
| Alzheimer Society Huron Perth, Stratford Office | Stratford |
| Alzheimer Society Huron Perth, Stratford Office, First Link, Alzheimer Society Huron Perth | Stratford |
| Alzheimer Society Huron Perth, Various Sites, First Link Learning Series | Stratford |
| Alzheimer Society Huron Perth, Vulnerable Persons Registry, Stratford Office | Stratford |
| ARCH Disability Law Centre | Toronto |
| Architectural Conservancy of Ontario, Stratford-Perth County Branch | Stratford |
| Army, Navy, and Air Force Veterans in Canada, Stratford, Unit 261 - Stratford | Stratford |
| Army, Navy, and Air Force Veterans in Canada, St Marys Branch 265 | St Marys |
| Arthritis Society Canada | Toronto Downtown Central |
| Arthritis Society Canada - South West Region, Perth Program, St Marys Memorial Hospital, Arthritis Rehabilitation and Education Program | St Marys |
| Assaulted Women's Helpline | Toronto |
| Association of Parent Support Groups in Ontario | Aurora |
| Atwood Lions Club | North Perth |
| Atwood Presbyterian Church | North Perth |
| Aunt Gail's Taxi | Stratford |
| Aura Freedom International | Toronto |
| Automobile Protection Association | Toronto |
| Avon Church | Stratford |
| Avon Cooperative Nursery School | Stratford |
| Avon Maitland District School Board, Centre for Employment and Learning - Adult High School Diploma Program, Listowel - Wallace Ave S | North Perth |
| Avon Maitland District School Board, Centre for Employment and Learning - Adult High School Diploma Program, Stratford | Stratford |
| Avon Maitland District School Board, Clinton - Central Huron Secondary School, Centre for Employment and Learning - ESL Program | Central Huron |
| Avon Maitland District School Board, Education Centre | Huron East |
| Avon Maitland District School Board, e-Learning Centre, Mitchell District High School | West Perth |
| Avon Maitland District School Board, Exeter, Centre for Employment and Learning - ESL Program | South Huron |
| Avon Maitland District School Board, Goderich District Collegiate Institute, Centre for Employment and Learning - ESL Program | Goderich |
| Avon Maitland District School Board, Listowel - Wallace Ave S, Centre for Employment and Learning - ESL Program | North Perth |
| Avon Maitland District School Board, Listowel - Wallace Ave S, Centre for Employment and Learning - Literacy and Basic Skills Program | North Perth |
| Avon Maitland District School Board, Listowel District Secondary School, Community-based Alternative Secondary Education | Listowel |
| Avon Maitland District School Board, Multilingual Language Learners Department, Education Centre | Huron East |
| Avon Maitland District School Board, No Physical Address, Riverside Rural Learning | Ontario |
| Avon Maitland District School Board, Ontario Youth Apprenticeship Program, Education Centre | Huron East |
| Avon Maitland District School Board, Stratford, Centre for Employment and Learning - ESL Program | Stratford |
| Avon Maitland District School Board, Wingham, Centre for Employment and Learning - ESL Program | North Huron |
| Avon Trail Hiking Assocation | Stratford |
| Avondale United Church, Meditation in our Community, Stratford | Stratford |
| Avondale United Church, Stratford | Stratford |
| Avondale United Church, Stratford, Community Meal | Stratford |
| Avondale United Church, Stratford, Food Shelf | Stratford |
| Avon-Thames Catholic Family of Parishes, Stratford - Immaculate Conception Church, Immaculate Conception Roman Catholic Church | Stratford |
| Avon-Thames Catholic Family of Parishes, Stratford - St Joseph's Church, Avon-Thames Catholic Family of Parishes - Community Kitchen | Stratford |
| Avon-Thames Catholic Family of Parishes, Stratford - St Joseph's Church, Avon-Thames Catholic Family of Parishes - Food Bank | Stratford |
| Avon-Thames Catholic Family of Parishes, Stratford - St Joseph's Church, St Joseph's Roman Catholic Church | Stratford |