Franklin County, Washington ZIP codes
6 ZIP codes are in Franklin County, plus 2 that cross in from neighboring counties. It's part of the Kennewick-Richland, WA metro area.
- ZIP codes
- 6
- Population in these ZIPs
- 98,034
- Avg. median income
- $87,300population-weighted
- Cities & towns
- 5
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Franklin County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 99301 | Pasco | 87,044 | $87,951 | $416,400 |
| 99302 PO Box | Pasco | — | — | — |
| 99326 | Connell | 6,336 | $82,500 | $318,500 |
| 99330 | Eltopia | 1,210 | $140,093 | $716,500 |
| 99335 | Kahlotus | 229 | $91,667 | $250,000 |
| 99343 | Mesa | 3,215 | $59,451 | $566,300 |
ZIP codes partly in Franklin County
These ZIP codes are mostly in a neighboring county but cover part of Franklin County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 99344 | Othello | Adams County | 19,534 | $64,888 | $333,800 |
| 99371 | Washtucna | Adams County | 394 | $77,500 | $217,500 |
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
Cities and towns in Franklin County
Nearby counties
Frequently asked questions
How many ZIP codes are in Franklin County, Washington?
6 ZIP codes are mainly in Franklin County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Franklin County?
ZIP codes in Franklin County use the city names Connell, Eltopia, Kahlotus, Mesa and Pasco.
What metro area is Franklin County in?
Franklin County is part of the Kennewick-Richland, WA metropolitan statistical area.