ZIP CodesZIP codes in Benton County, Washington
Benton County, Washington has 10 ZIP codes in this list, from 99320 to 99354. They cover 7 places, among them Kennewick, Richland, Benton City and Paterson.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 99320 | Benton City | 209 | 46.281, -119.491 |
| 99336 | Kennewick | 13.4 | 46.211, -119.168 |
| 99337 | Kennewick | 166 | 46.181, -119.138 |
| 99338 | Kennewick | 35.5 | 46.156, -119.264 |
| 99345 | Paterson | 126 | 45.991, -119.756 |
| 99346 | Plymouth | 143 | 45.930, -119.402 |
| 99350 | Prosser | 600 | 46.223, -119.771 |
| 99352 | Richland | 24.0 | 46.252, -119.288 |
| 99353 | West Richland | 25.8 | 46.315, -119.371 |
| 99354 | Richland | 23.9 | 46.326, -119.307 |
The ZIP code areas of Benton County add up to about 1,367 square miles of land (3,541 sq km) as the Census Bureau draws them. The largest is 99350 (Prosser), with 600 square miles.
Places with more than one code here: Kennewick (3 codes), Richland (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Benton City, WA 99320.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.