There are 7 zip codes in Union County, Oregon. The most populated is 97850, located in La Grande. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
9785016,646La Grande
978272,599Elgin
978832,575Union
978241,965Cove
978761,085Summerville
978671,001North Powder
97841491Imbler

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