| Ortschaft | Postleitzahl |
|---|---|
| Barlow, Foster | 58421 |
| Bordulac, Foster | 58421 |
| Carrington, Foster | 58421 |
| Dover, Foster | 58421 |
| Glenfield, Foster | 58443 |
| Grace City, Foster | 58445 |
| Juanita, Foster | 58443 |
| McHenry, Foster | 58464 |
| Melville, Foster | 58421 |
| Rose Hill, Foster | 58421 |