ZIP codes in Kittitas County
12 ZIPs touch Kittitas County, Washington. The blue dashed line is the county border; orange ZIPs reach into it.
12
ZIP codes
3
cross the county line
80,384
people in these ZIPs
39
counties in WA
Most people
Kittitas County ZIP list
More counties in Washington
- Grant County19
- Grays Harbor County22
- Island County8
- Jefferson County9
- King County123
- Kitsap County28
- Klickitat County16
- Lewis County25
- Lincoln County16
- Mason County15
- Okanogan County22
- Pacific County17
Questions people actually ask
How many ZIP codes are in Kittitas County, Washington?
12 ZIP codes reach into Kittitas County. 3 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Kittitas County has the most people?
98926 (Ellensburg) has about 34,353 residents, the most of any ZIP touching Kittitas County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Kittitas 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 Kittitas 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