Post Offices List in Waterloo City, Iowa:
| Waterloo Post Office | 300 Sycamore St, Waterloo, IA 50701 |
| Waterloo Annex Post Office | 3314 Marnie Ave, Waterloo, IA 50701 |
| Waterloo Post Office | 300 Sycamore St, Waterloo, IA 50701 |
| Waterloo Annex Post Office | 3314 Marnie Ave, Waterloo, IA 50701 |