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".
Cities, Towns, Neighborhoods & Other Populated Places in Gilliam County.
|Arlington||City in Oregon, USA||Gilliam||626|
|Condon||City in Oregon, USA||Gilliam||714|
|Lonerock||City in Oregon, USA||Gilliam||22|