Franklin County, WA ZIP codes
Franklin County, WA has 6 ZIP codes, in 5 towns: 99301, 99326, 99343, 99330, 99302 and 99335. 1 more crosses into it from a neighbouring county: 99344.
The county seat is Pasco.
- ZIP codes
- 6
- Partly in it
- 1 more
- Towns
- 5
- County seat
- Pasco
- County FIPS
53021- State
- Washington
- Population
- 98,902
- Median household income
- $86,714
- Land area
- 1,242 sq mi
- Area code
- 509
- Metro area
- Kennewick-Richland
Franklin 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.
ZIP codes partly in Franklin County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Franklin County.
- 99344 Othello · mostly in Adams County
Map of Franklin County ZIP codes
The ZIP codes of Franklin 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.
Franklin County in numbers
About 98,902 people live in Franklin County, in 29,890 households, the 14th most populous of Washington's 39 counties. The median household income is $86,714 a year, 12% below the Washington median of $98,141 (US: $80,734). The median owner-occupied home is valued at $379,300 (33% below the Washington median), and median gross rent is $1,198 a month. The median age is 30.9; 21.1% of adults 25 and over hold a bachelor's degree or higher (39.6% across Washington); the average commute takes 22 minutes.
| Population | 98,902 |
|---|---|
| Households | 29,890 |
| Median age | 30.9 |
| Median household income | $86,714 |
| Median home value | $379,300 |
| Median gross rent | $1,198 |
| Bachelor's degree or higher | 21.1% |
| Mean commute | 22.4 min |
| Population density | 80 / 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 Franklin County
| Town | ZIP codes | Population |
|---|---|---|
| Pasco | 2 | 79,575 |
| Connell | 1 | 5,054 |
| Eltopia | 1 | 1,210 |
| Mesa | 1 | 502 |
| Kahlotus | 1 | 124 |
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 Franklin County.
Not sure you are in Franklin County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Franklin County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
99301 | Pasco , WA | Standard | 87,044 | $87,951 | $385,500 |
99302 | Pasco , WA | No street area | — | — | — |
99326 | Connell , WA | Standard | 6,336 | $82,500 | $320,800 |
99330 | Eltopia , WA | Standard | 1,210 | $140,093 | $554,200 |
99335 | Kahlotus , WA | Standard | 229 | $91,667 | $250,000 |
99343 | Mesa , WA | Standard | 3,215 | $59,451 | $253,000 |
Cite this page
zipcodes.pro. “Franklin County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wa/county/franklin
Underlying data is public domain or openly licensed — sources, vintages and licences.