| Locality | Post Code |
|---|---|
| Badger, Humboldt | 50516 |
| Bode, Humboldt | 50519 |
| Bradgate, Humboldt | 50520 |
| Dakota City, Humboldt | 50529 |
| Gilmore City, Humboldt | 50541 |
| Hardy, Humboldt | 50545 |
| Humboldt, Humboldt | 50548 |
| Livermore, Humboldt | 50558 |
| Ottosen, Humboldt | 50570 |
| Renwick, Humboldt | 50577 |
| Rutland, Humboldt | 50582 |
| Saint Joseph, Humboldt | 50519 |
| Thor, Humboldt | 50591 |