| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Benton City, Benton | 99320 |
| Postal/ZIP Codes in Finley, Benton | 99336 |
| Postal/ZIP Codes in Hanford Works, Benton | 99352 |
| Postal/ZIP Codes in Kennewick, Benton | 99336, 99337, 99338 |
| Postal/ZIP Codes in Kiona, Benton | 99320 |
| Postal/ZIP Codes in North Prosser, Benton | 99350 |
| Postal/ZIP Codes in Paterson, Benton | 99345 |
| Postal/ZIP Codes in Plymouth, Benton | 99346 |
| Postal/ZIP Codes in Prosser, Benton | 99350 |
| Postal/ZIP Codes in Richland, Benton | 99352, 99354 |
| Postal/ZIP Codes in West Richland, Benton | 99353 |