County ZIP codes · Washington · FIPS 53003

Asotin County, WA ZIP Codes

Asotin County, Washington has 3 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 1 of the residential ones extends into a neighboring county. Median household income ranges from $71,482 in 99403 (Clarkston) to $78,906 in 99402 (Asotin) (Census Bureau, ACS 2020-2024).

ACS2020-24
Census2020

Where are the ZIP codes of Asotin County?

The residential ZIP codes of Asotin County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

99403 · $72k 99402 · $79k

They carry 3 postal town names: Clarkston, Asotin, Anatone.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 3 residential ZIP codes in Asotin County

Residential ZIP codes mainly in Asotin County, largest first; "In this county" is the share of the ZIP's land in the county
						In this county
99403	Clarkston	20,760	145	$72k	$325k	80%
99402	Asotin	1,557	5	$79k	$340k	100%
99401	Anatone	163	1	$41k	$323k	100%

Download the 3 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

1 ZIP code of Asotin County extends into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Asotin County and in the neighboring counties
ZIP	In Asotin	Elsewhere
99403	80%	Garfield County 20%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Asotin County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Asotin County starts with 994.

Three-digit prefixes of Asotin County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Asotin County's
Prefix	Sectional center	Here	All codes
994	Spokane, WA (SCF 990)	3	3

All 3 ZIP codes that start with 994 are Asotin County's: 3 residential codes, sorted at Spokane, WA (SCF 990).

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.