Pendleton is a city in and the county seat of Umatilla County, Oregon, United States. The population was 17,107 at the time of the 2020 cen…Pendleton is a city in and the county seat of Umatilla County, Oregon, United States. The population was 17,107 at the time of the 2020 census, which includes approximately 1,600 people who are incarcerated at Eastern Oregon Correctional Institution.
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