| Business | Phone |
| Town Of Winthrop 167 Main St, Winthrop 4364 | (207) 377-2235 |
| Winthrop Ambulance 29 Town Hall Ln, Winthrop 4364 | (207) 377-2226 |
| Winthrop Assessor's Office 15 Town Hall Ln, Winthrop 4364 | (207) 377-7212 |
| Winthrop Highway Garage 57 Main St, Winthrop 4364 | (207) 377-7221 |
| Winthrop Manager's Office 57 Main St, Winthrop 4364 | (207) 377-7205 |
| Winthrop Town Office 57 Main St, Winthrop 4364 | (207) 377-7200 |
| Winthrop Transfer Station Route 202, Winthrop 4364 | (207) 377-7222 |