Gilliam County, county in Oregon, United States. As of 2020 county had an estimated population of 1,975 inhabitants. The county was created 137 years ago in 1885. Its county seat is "Condon".
There are 1 city/town in Gilliam County, OR. The largest city of Gilliam County is Arlington with a population of 626.
Cities, Towns, Neighborhoods & Other Populated Places in Gilliam County.
|Arlington||City in Oregon, USA||Gilliam||626|