ZIP code · Farmington · Washington · United States
ZIP code 99128 — Farmington
ZIP code 99128 serves Farmington, Washington.
- Postal code
- 99128Single source Value from one source, not cross-checked.
- City
- Farmington
- County
- Whitman
- State
- Washington
- Country
- United States
- Coordinates
- 47.0847, -117.0763 — precision precise (locality)
View on OpenStreetMap - Population
- 248 (ZCTA, ACS 5-year)
- Median household income
- $58,194
- Median age
- 51
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
- Area code
- 509Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS). Data generated on 2026-08-21. Methodology · Report an error on this page