|Gilliam County Oregon Cities/Towns - Arlington, Condon (County Seat), Lonerock
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Gilliam County is a county located in the U.S. state of Oregon. The county was established in 1885. In 2016, the population was 1,854. The seat of the county is Condon.
It is named for Cornelius Gilliam, who commanded the forces of the provisional government of Oregon after the Whitman Massacre.