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County ZIP codes · Washington · FIPS 53023

Garfield County, WA ZIP Codes

Garfield County, Washington has 2 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 1 of the residential ones lie mainly in Garfield County and 1 mainly in a neighboring county; 2 cross the county line. Median household income ranges from $64,699 in 99347 (Pomeroy) to $71,482 in 99403 (Clarkston) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Garfield County?

99347 · Pomeroy: $65k99403 · Clarkston: $72k993479940399347 · Pomeroy: $65k99403 · Clarkston: $72k993479940399347 · Pomeroy: $65k99403 · Clarkston: $72k9934799403
The residential ZIP codes of Garfield 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?

They carry 2 postal town names: Clarkston, Pomeroy.

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

All 2 residential ZIP codes in Garfield County

1 ZIP code lies mainly in Garfield County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Garfield County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
99347 Pomeroy 2,512 3 $65k $243k 89%

Partly in Garfield County

Residential ZIP codes mainly in another county that reach at least 1% into Garfield County, by their share here
In this county
99403 Clarkston 20,760 145 $72k $325k 20%

Download the 2 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?

2 ZIP codes of Garfield County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Garfield County and in the neighboring counties
ZIPIn GarfieldElsewhere
9940320%Asotin County80%
9934789%Columbia County10%; Whitman County2%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Garfield County's ZIP codes use 2 prefixes: 993 and 994.

Three-digit prefixes of Garfield 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 Garfield County's
PrefixSectional centerHereAll codes
993Spokane, WA (SCF 990)136
994Spokane, WA (SCF 990)13

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