| Wallace Minor Soccer, Wallace Optimist Park | North Perth |
| Walther's IDA Pharmacy | Mitchell |
| Wellspring Stratford Cancer Support Centre | Stratford |
| West End Pharmacy | Stratford |
| West Perth. Municipal Office, Municipal Office - Wellington St | West Perth |
| West Perth. Municipal Office, West Perth Community Centre | West Perth |
| West Perth. Municipal Office, West Perth Community Services - West Perth Youth Centre, West Perth Youth Centre | West Perth |
| West Perth. Municipal Office, West Perth Fire Department, Fire Department - Wellington St | West Perth |
| West Perth. Municipal Office, West Perth Lions Pool | West Perth |
| West Perth. Municipal Office, West Perth Public Library, Community Volunteer Income Tax Program - Tax Clinic | West Perth |
| West Perth. Municipal Office, West Perth Public Library | West Perth |
| West Perth. Municipal Office, West Perth Thames Nature Trail and Wetlands | West Perth |
| Western Ontario Athletic Association | North Huron |
| Western University - Schulich Medicine & Dentistry, Discovery Healthcare - A Summer Camp Experience, Goderich - Camp Klahanie | Central Huron |
| Western University - Schulich Medicine & Dentistry, Discovery Healthcare - A Summer Camp Experience, Stratford - Stratford General Hospital | Stratford |
| Wild Honey Concierge Services | Stratford |
| Wildwood Sailing Club | St Marys |
| Wingham & District Snowmobile Club | North Huron |
| Wingham Minor Hockey Association | North Huron |
| Wingham Taxi | North Huron |
| Woodstock Driverseat, Woodstock - No Physical Address | Woodstock |
| Workers Health and Safety Legal Clinic | Toronto |
| Workplace Safety and Insurance Board, Toronto Office | Toronto |
| Writers' Trust of Canada | Toronto |