ZIP codes in Gilliam County
5 ZIPs touch Gilliam County, Oregon. The blue dashed line is the county border; orange ZIPs reach into it.
5
ZIP codes
3
cross the county line
3,551
people in these ZIPs
36
counties in OR
Most people
Gilliam County ZIP list
More counties in Oregon
- Columbia County9
- Coos County11
- Crook County7
- Curry County9
- Deschutes County11
- Douglas County30
- Grant County12
- Harney County10
- Hood River County4
- Jackson County18
- Jefferson County8
- Josephine County13
Questions people actually ask
How many ZIP codes are in Gilliam County, Oregon?
5 ZIP codes reach into Gilliam County, including 1 PO Box or single-address ZIPs placed by the town they serve. 3 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Gilliam County has the most people?
97823 (Condon) has about 1,014 residents, the most of any ZIP touching Gilliam County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Gilliam 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 Gilliam 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.
Keep exploring
Updated 2026-11-10 · Where the data comes from