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ZIP codes in Morrow County

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

7

ZIP codes

3

cross the county line

41,920

people in these ZIPs

36

counties in OR

Most people

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Morrow County ZIP list

More counties in Oregon

All 36 counties in Oregon

Questions people actually ask

How many ZIP codes are in Morrow County, Oregon?

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

Which ZIP code in Morrow County has the most people?

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

Can a ZIP code be in Morrow 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 Morrow 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