Post Offices List in Yankton County, South Dakota:
| Gayville Post Office | 508 Washington St, Gayville, SD 57031 |
| Irene Post Office | 205 W Main St, Irene, SD 57037 |
| Lesterville Post Office | 223 Main Ave, Lesterville, SD 57040 |
| Mission Hill Post Office | 109 Washington Ave S, Mission Hill, SD 57046 |
| Utica Post Office | 109 2nd St, Utica, SD 57067 |
| Volin Post Office | 205 Main St, Volin, SD 57072 |
| Yankton Post Office | 506 W 25th St, Yankton, SD 57078 |