There are 13 zip codes in Umatilla County, Oregon. The most populated is 97838, located in Hermiston. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9783827,713Hermiston
9780121,748Pendleton
9786212,460Milton Freewater
978828,081Umatilla
978752,608Stanfield
978681,594Pilot Rock
978131,468Athena
978261,185Echo
978101,047Adams
97886948Weston
97835488Helix
97880348Ukiah
97859235Meacham

Zip Codes in Umatilla County, Oregon by Population (2024)