Post Offices List in Marshall County, Kentucky:
| Benton Post Office | 219 W 5th St, Benton, KY 42025 |
| Calvert City Post Office | 134 E 5th Ave, Calvert City, KY 42029 |
| Gilbertsville Post Office | 119 Administration Ave, Gilbertsville, KY 42044 |
| Hardin Post Office | 85 Commerce St, Hardin, KY 42048 |