ZIP codes in Whitman County
24 ZIPs touch Whitman County, Washington. The blue dashed line is the county border; orange ZIPs reach into it.
24
ZIP codes
6
cross the county line
72,667
people in these ZIPs
39
counties in WA
Most people
Whitman County ZIP list
More counties in Washington
- Spokane County60
- Stevens County21
- Thurston County23
- Wahkiakum County6
- Walla Walla County8
- Whatcom County21
- Yakima County26
Questions people actually ask
How many ZIP codes are in Whitman County, Washington?
24 ZIP codes reach into Whitman County, including 2 PO Box or single-address ZIPs placed by the town they serve. 6 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Whitman County has the most people?
99163 (Pullman) has about 34,022 residents, the most of any ZIP touching Whitman County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Whitman County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Whitman County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from