| Business | Phone |
| Bank Of America 105 Main St, Winthrop 4364 | (207) 377-6925 |
| Bank Of America 377 Main St, Winthrop 4364 | (207) 377-8705 |
| Kennebec Savings Bank 84 Main St, Winthrop 4364 | (207) 377-5801 |
| Key Bank 107 Main St, Winthrop 4364 | (207) 377-2202 |
| Gardiner Savings Institution 18 Main St, Winthrop 4364 | (207) 377-3159 |