Umatilla County, county in Oregon, United States. As of 2020 county had an estimated population of 77,752 inhabitants. The county was created 160 years ago in 1862. Its county seat is "Pendleton".
Cities, Towns, Neighborhoods & Other Populated Places in Umatilla County.
|Helix||City in Oregon, USA||Umatilla||191|
|Hermiston||City in Oregon, USA||Umatilla||17,791|