There are 11 zip codes in Grant County, Oregon. The most populated is 97845, located in John Day. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
97845John Day2,300
97820Canyon City1,137
97865Mount Vernon1,133
97869Prairie City938
97856Long Creek498
97825Dayville407
97877Sumpter319
97864Monument295
97848Kimberly215
97873Seneca167
97817Bates37

Grant County, Oregon Zip Codes by Population (2024)