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County Information



Some of the cities, towns, and places in Gilliam County are Arlington, Blalock, Clem, Condon, Gwendolen, Lonerock, Mayville, Mikkalo, Olex, Rock Creek, Thirtymile

Gilliam County  Image

Gilliam County is one of the 36 counties in the U.S. state of Oregon. As of the 2010 census, the population was 1,871, 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, who commanded the forces of the provisional government of Oregon after the Whitman Massacre.