Post Offices List in Lagrangeville City, New York:
| Lagrangeville Post Office | 1085 Route 55, Lagrangeville, NY 12540 |
| Hopewell Carrier Annex Post Office | 1616 Route 82, Lagrangeville, NY 12540 |
| Lagrangeville Post Office | 1085 Route 55, Lagrangeville, NY 12540 |
| Hopewell Carrier Annex Post Office | 1616 Route 82, Lagrangeville, NY 12540 |