Quick Facts
| County seat | Condon |
|---|---|
| Region | North Central Oregon |
| Population (2020 Census) | 1,971 |
| Land & water area | 1,204 sq mi |
| Population density | 1.6 people per sq mi |
| Established | 1885 |
| Formed from | Eastern third of Wasco County |
| Name origin | Named for Oregon pioneer Cornelius Gilliam (1798–1848). |
| Incorporated cities | 3 |
| Main electric utility | Columbia Basin Electric Cooperative |
| FIPS code | 41021 |
| Official county website | co.gilliam.or.us |
About Gilliam County
Gilliam County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 1,995, making it the third-least populous county in Oregon. The county seat is Condon. The county was established in 1885 and is named for Cornelius Gilliam, a colonel who commanded the forces of the provisional government of Oregon after the Whitman Massacre.
Source: adapted from Wikipedia, available under CC BY-SA 4.0.
Cities in Gilliam County
| City | Population (2020) | Incorporated |
|---|---|---|
| Condon ★ | 711 | 1893 |
| Arlington | 628 | 1885 |
| Lonerock | 25 | 1901 |
★ county seat. Cities that span more than one county are listed in each.