ZIP CodesZIP codes in Franklin County, Washington
Franklin County, Washington has 6 ZIP codes in this list, from 99301 to 99343. They cover 5 places, among them Pasco, Connell, Eltopia and Kahlotus.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 99301 | Pasco | 486 | 46.249, -119.104 |
| 99302 | Pasco | no area | 46.235, -119.094 |
| 99326 | Connell | 243 | 46.664, -118.855 |
| 99330 | Eltopia | 87.5 | 46.475, -119.101 |
| 99335 | Kahlotus | 153 | 46.678, -118.534 |
| 99343 | Mesa | 181 | 46.578, -119.137 |
The ZIP code areas of Franklin County add up to about 1,150 square miles of land (2,978 sq km) as the Census Bureau draws them. The largest is 99301 (Pasco), with 486 square miles.
Places with more than one code here: Pasco (2 codes).
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Pasco, WA 99301.
- 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.