Gilliam County, Oregon ZIP codes
3 ZIP codes are in Gilliam County, plus 2 that cross in from neighboring counties.
- ZIP codes
- 3
- Population in these ZIPs
- 1,946
- Avg. median income
- $67,100population-weighted
- Cities & towns
- 3
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ZIP codes in Gilliam County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 97812 | Arlington | 932 | $77,258 | $296,500 |
| 97823 | Condon | 1,014 | $57,727 | $215,000 |
| 97861 PO Box | Mikkalo | — | — | — |
ZIP codes partly in Gilliam County
These ZIP codes are mostly in a neighboring county but cover part of Gilliam County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 97830 | Fossil | Wheeler County | 800 | $54,583 | $241,000 |
| 97843 | Ione | Morrow County | 805 | $104,435 | $221,500 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Gilliam County
Nearby counties
Frequently asked questions
How many ZIP codes are in Gilliam County, Oregon?
3 ZIP codes are mainly in Gilliam County, and 2 more ZIP codes from neighboring areas reach partly into it.
What cities are in Gilliam County?
ZIP codes in Gilliam County use the city names Arlington, Condon and Mikkalo.