ZIP codes in Umatilla County

13 ZIPs touch Umatilla County, Oregon. The blue dashed line is the county border; orange ZIPs reach into it.

ZIP codes

cross the county line

80,001

people in these ZIPs

counties in OR

Most people

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Umatilla County ZIP list

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Questions people actually ask

How many ZIP codes are in Umatilla County, Oregon?

13 ZIP codes reach into Umatilla County. 3 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Umatilla County has the most people?

97838 (Hermiston) has about 28,512 residents, the most of any ZIP touching Umatilla County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Umatilla 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 Umatilla 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