| Ortschaft | Postleitzahl |
|---|---|
| Benton City, Benton | 99320 |
| Finley, Benton | 99336 |
| Hanford Works, Benton | 99352 |
| Kennewick, Benton | 99336, 99337, 99338 |
| Kiona, Benton | 99320 |
| North Prosser, Benton | 99350 |
| Paterson, Benton | 99345 |
| Plymouth, Benton | 99346 |
| Prosser, Benton | 99350 |
| Richland, Benton | 99352, 99354 |
| West Richland, Benton | 99353 |