Kennewick-Richland, WA metro area ZIP codes
The Kennewick-Richland, WA metropolitan statistical area (CBSA 28420) covers 2 counties in Washington and 17 ZIP codes.
- ZIP codes
- 17
- Population
- 332,822
- Avg. median income
- $88,200population-weighted
- Counties
- 2
Click anywhere on the map to see which ZIP code it's in.
Counties in the Kennewick-Richland, WA area
ZIP codes in the Kennewick-Richland, WA area
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 98944 | Sunnyside | Benton County | 22,817 | $64,276 | $319,100 |
| 99301 | Pasco | Franklin County | 87,044 | $87,951 | $416,400 |
| 99302 PO Box | Pasco | Franklin County | — | — | — |
| 99320 | Benton City | Benton County | 9,879 | $90,102 | $434,700 |
| 99326 | Connell | Franklin County | 6,336 | $82,500 | $318,500 |
| 99330 | Eltopia | Franklin County | 1,210 | $140,093 | $716,500 |
| 99335 | Kahlotus | Franklin County | 229 | $91,667 | $250,000 |
| 99336 | Kennewick | Benton County | 50,735 | $62,527 | $367,400 |
| 99337 | Kennewick | Benton County | 33,287 | $98,848 | $429,600 |
| 99338 | Kennewick | Benton County | 20,633 | $111,042 | $555,200 |
| 99343 | Mesa | Franklin County | 3,215 | $59,451 | $566,300 |
| 99345 | Paterson | Benton County | 162 | $102,500 | $415,500 |
| 99346 | Plymouth | Benton County | 198 | $50,865 | $209,200 |
| 99350 | Prosser | Benton County | 14,837 | $81,014 | $415,900 |
| 99352 | Richland | Benton County | 37,430 | $100,108 | $494,500 |
| 99353 | West Richland | Benton County | 19,251 | $121,845 | $495,500 |
| 99354 | Richland | Benton County | 25,559 | $91,933 | $415,400 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Frequently asked questions
How many ZIP codes are in the Kennewick-Richland, WA metro area?
17 ZIP codes, based on each ZIP code's main county.
Which counties make up the Kennewick-Richland, WA area?
Benton County and Franklin County.
What is an MSA?
A metropolitan statistical area (MSA) is a core city of 50,000+ people plus the surrounding counties tied to it by commuting, as defined by the U.S. Office of Management and Budget. Micropolitan areas have a core of 10,000–50,000. Together they are called core-based statistical areas (CBSAs).