Post Offices List in Guilford City, Connecticut:
| Guilford Post Office | 42 Water St, Guilford, CT 06437 |
| Guilford/Madison Car Annex Post Office | 60 Shoreline Dr, Guilford, CT 06437 |
| Guilford Post Office | 42 Water St, Guilford, CT 06437 |
| Guilford/Madison Car Annex Post Office | 60 Shoreline Dr, Guilford, CT 06437 |