| Business | Phone |
| Homestead Realty 3 Charles St, Winthrop 4364 | (207) 377-2223 |
| Coldwell Banker 75 Main St, Winthrop 4364 | (207) 377-2122 |
| D & D Realty Inc 30 Summer St, Winthrop 4364 | (207) 377-2221 |
| Davis Real Estate Agency 90 Old Village Rd, Winthrop 4364 | (207) 933-4900 |
| Jean Dodge 75 Main St, Winthrop 4364 | (207) 215-7044 |
| Pauline Richard 75 Main St, Winthrop 4364 | (207) 626-0111 |
| Mike Tondrau 75 Main St, Winthrop 4364 | (207) 623-5102 |
| Winthrop Real Estate Realtors 90 Old Village Rd, Winthrop 4364 | (207) 395-4121 |