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
City
Population
97838Hermiston27,713
97801Pendleton21,748
97862Milton Freewater12,460
97882Umatilla8,081
97875Stanfield2,608
97868Pilot Rock1,594
97813Athena1,468
97826Echo1,185
97810Adams1,047
97886Weston948
97835Helix488
97880Ukiah348
97859Meacham235

Umatilla County, Oregon Zip Codes by Population (2024)