| Beef Farmers of Ontario, No Physical Address - Perth County | Ontario |
| College of Audiologists and Speech Language Pathologists of Ontario | Toronto Downtown North |
| College of Early Childhood Educators | Toronto |
| College of Physicians and Surgeons of Ontario | Toronto Downtown Central |
| College of Psychologists of Ontario (The) | Toronto Downtown North |
| College of Registered Psychotherapists of Ontario | Toronto Downtown |
| Dietitians of Canada | Toronto Downtown Central |
| Hannah McGraw - Registered Dietitian, Virtual only | Ontario |
| Huron Perth Public Health, Stratford - West Gore St., School Health - Perth County | Stratford |
| Jersey Club - Perth Huron, No Physical Address | Ontario |
| John R Field Counselling and Consulting, Farm Family Distress Management | St Marys |
| Ontario Camps Association | Toronto |
| Ontario Canola Growers' Association | Grey Highlands |
| Ontario Dental Association | Toronto Downtown North |
| Ontario Federation of Teaching Parents | |
| Ontario Motor Vehicle Industry Council | Toronto |
| Ontario Woodlot Association, Huron Perth Chapter | Stratford |
| Ontario. Ministry of Agriculture, Food and Agribusiness, Clinton, Clinton Resource Centre | Central Huron |
| Perth County Federation of Agriculture, Mailing Address | Ontario |
| Perth-Huron Builders Association, Mailing Address | Stratford |
| Prisoners HIV / AIDS Support Action Network, Toronto, Prisoners HIV/AIDS Support Action Network | Toronto |
| Quality In Lifelong Learning Network, QUILL Learning Network, Literacy and Basic Skills Support Organization | Huron East |
| Second Harvest Canada, Toronto | Toronto |
| Soil and Crop Improvement Association, Environmental Farm Plan | Ontario |
| Soil and Crop Improvement Association, Mailing Address Only - Perth County, Sustainable Canadian Agricultural Program (Sustainable CAP) | Ontario |
| STAR Family Health Team, O'Loane Medical Clinic | Stratford |
| Stratford Chefs School | Stratford |
| Stratford Musicians' Association, American Federation of Musicians Local 418 | St Marys |
| The Guardian Network, Field Service | Toronto |
| Writers' Trust of Canada | Toronto |