| Zip Code | City | Population ↓ |
|---|---|---|
| 99336 | Kennewick | 50,735 |
| 99352 | Richland | 37,430 |
| 99337 | Kennewick | 33,287 |
| 99354 | Richland | 25,559 |
| 98944 | Sunnyside | 22,817 |
| 99338 | Kennewick | 20,633 |
| 99353 | West Richland | 19,251 |
| 99350 | Prosser | 14,837 |
| 99320 | Benton City | 9,879 |
| 99346 | Plymouth | 198 |
| 99345 | Paterson | 162 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Benton County, Washington (US Census).