| Locality | Post Code |
|---|---|
| Algona, Kossuth | 50511 |
| Armstrong, Kossuth | 50514 |
| Bancroft, Kossuth | 50517 |
| Bode, Kossuth | 50519 |
| Burt, Kossuth | 50522 |
| Fenton, Kossuth | 50539 |
| Galbraith, Kossuth | 50560 |
| German Valley, Kossuth | 50480 |
| Hanna, Kossuth | 50560 |
| Hobarton, Kossuth | 50511 |
| Irvington, Kossuth | 50560 |
| Lakota, Kossuth | 50451 |
| Ledyard, Kossuth | 50556 |
| Livermore, Kossuth | 50558 |
| Lone Rock, Kossuth | 50559 |
| Lotts Creek, Kossuth | 50559 |
| Lu Verne, Kossuth | 50560 |
| Ottosen, Kossuth | 50570 |
| Saint Benedict, Kossuth | 50511 |
| Seneca, Kossuth | 50539 |
| Sexton, Kossuth | 50483 |
| Swea City, Kossuth | 50590 |
| Titonka, Kossuth | 50480 |
| Wesley, Kossuth | 50483 |
| West Bend, Kossuth | 50597 |
| Whittemore, Kossuth | 50598 |