Home > WA > Whitman County > Farmington > Zip 99128

Zip Code 99128 — Farmington, WA

99128 is a ZIP Code associated with Farmington, WA, located within Whitman. The postal region supports an estimated population of 259 residents across Data Pending housing units, with a population density of 1.7 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (47.100450, -117.085230)

Data MetricLocal Statistic
Postal / Zip Code99128
Primary CityFarmington
State / ProvinceWA
CountyWhitman
Total Population259
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density1.7 people/sq mi
TimezoneAmerica/Los_Angeles

How 99128 Compares

MetricZIP 99128Whitman CountyWA State Average
Population25947,2847,816,021
Median IncomeData PendingN/AN/A
Population Density1.7 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 99158Oakesdale7.6 mi561N/A
Zip 99130Garfield8.4 mi693N/A
Zip 99033Tekoa9.0 mi832N/A
Zip 99018Latah13.6 mi272N/A
Zip 99174Steptoe14.3 mi69N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →