Benton County, WA ZIP codes
There are 11 ZIP codes in Benton County, WA, in 8 towns, from 98944 to 99354. The largest are 99336 (Kennewick), 99352 (Richland) and 99337 (Kennewick).
The county seat is Prosser.
- ZIP codes
- 11
- Towns
- 8
- County seat
- Prosser
- County FIPS
53005- State
- Washington
- Population
- 212,905
- Median household income
- $89,874
- Land area
- 1,700 sq mi
- Area code
- 509
- Metro area
- Kennewick-Richland
Benton County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Benton County ZIP codes
The ZIP codes of Benton County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Benton County in numbers
About 212,905 people live in Benton County, in 78,046 households, the 10th most populous of Washington's 39 counties. The median household income is $89,874 a year, 8% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $407,800 (28% below the Washington median), and median gross rent is $1,306 a month. The median age is 36.3; 33.2% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 22 minutes.
| Population | 212,905 |
|---|---|
| Households | 78,046 |
| Median age | 36.3 |
| Median household income | $89,874 |
| Median home value | $407,800 |
| Median gross rent | $1,306 |
| Bachelor's degree or higher | 33.2% |
| Mean commute | 22.2 min |
| Population density | 125 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Benton County
| Town | ZIP codes | Population |
|---|---|---|
| Kennewick | 3 | 85,295 |
| Richland | 2 | 62,753 |
| West Richland | 1 | 17,586 |
| Sunnyside | 1 | 16,277 |
| Prosser | 1 | 6,305 |
| Benton City | 1 | 3,695 |
| Plymouth | 1 | 198 |
| Paterson | 1 | 162 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Benton County.
Not sure you are in Benton County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Benton County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
98944 | Sunnyside , WA | Standard | 22,817 | $64,276 | $260,000 |
99320 | Benton City , WA | Standard | 9,879 | $90,102 | $373,500 |
99336 | Kennewick , WA | Standard | 50,735 | $62,527 | $324,400 |
99337 | Kennewick , WA | Standard | 33,287 | $98,848 | $395,500 |
99338 | Kennewick , WA | Standard | 20,633 | $111,042 | $551,500 |
99345 | Paterson , WA | Standard | 162 | $102,500 | $415,500 |
99346 | Plymouth , WA | Standard | 198 | $50,865 | $209,200 |
99350 | Prosser , WA | Standard | 14,837 | $81,014 | $338,500 |
99352 | Richland , WA | Standard | 37,430 | $100,108 | $474,100 |
99353 | West Richland , WA | Standard | 19,251 | $121,845 | $450,500 |
99354 | Richland , WA | Standard | 25,559 | $91,933 | $392,600 |
Cite this page
zipcodes.pro. “Benton County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wa/county/benton
Underlying data is public domain or openly licensed — sources, vintages and licences.