Find the last 4 digits (ZIP+4) for an address in 99128

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ZIP Code 99128 – Farmington, WA

Farmington, Washington · Whitman County · Pacific time

ZIP code99128
CityFarmington
StateWashington
CountyWhitman CountyLatah County
Population259
Time zonePacific · local time
ZIP typeStandard (has a Census ZCTA area)
Land area59.49 sq mi
Center (lat, long)47.0979, -117.0813

Area codes in this area

509

These are the area codes that most often serve ZIP 99128 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

99104 Belmont · 4.7 mi83824 Desmet · 6.5 mi99158 Oakesdale · 7.8 mi99130 Garfield · 8.4 mi99033 Tekoa · 9.2 mi83870 Tensed · 11.1 mi83855 Potlatch · 11.5 mi99161 Palouse · 13.8 mi

About ZIP 99128

ZIP code 99128 is assigned to Farmington, Washington. It crosses 2 counties; most of its land is in Whitman County. Its Census area covers about 59.49 square miles of land. The closest neighboring ZIP is 99104 (Belmont), about 4.7 miles away.

Every address in 99128 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources