Umatilla County /ˌjuːməˈtɪlə/ is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 75,889. The county seat is Pendleton, but the largest city is Hermiston. The county is named for the Umatilla River.
According to the U.S. Census Bureau, the county has a total area of 3,231 square miles (8,370 km), of which 3,216 square miles (8,330 km) are land and 16 square miles (41 km) (0.5%) are covered by water. It borders the Columbia River across from Washington.
As of the 2010 United States Census, 75,889 people, 26,904 households, and 18,647 families resided in the county. The population density was 23.6 inhabitants per square mile (9.1/km). The 29,693 housing units had an average density of 9.2 per square mile (3.6/km). The racial makeup of the county was 79.1% White, 3.5% American Indian, 0.9% Asian, 0.8% Black or African American, 0.1% Pacific islander, 12.5% from other races, and 3.1% from two or more races. Those of Hispanic or Latino origin made up 23.9% of the population. In terms of ancestry, 21.4% were German, 12.8% were Irish, 11.6% were English, and 5.6% were American.
Of the 26,904 households, 36.4% had children under the age of 18 living with them, 50.9% were married couples living together, 12.0% had a female householder with no husband present, 30.7% were non-families, and 24.7% of all households were made up of individuals. The average household size was 2.67 and the average family size was 3.17. The median age was 35.7 years.
The median income for a household in the county was $45,861 and for a family was $53,585. Males had a median income of $39,288 versus $30,489 for females. The per capita income for the county was $20,035. About 11.0% of families and 15.8% of the population were below the poverty line, including 21.4% of those under age 18 and 9.5% of those age 65 or over.
Strong economic growth in the west end of the county has propelled Hermiston well past Pendleton with the highest median household incomes in Umatilla County.
Umatilla County Oregon neighborhoods include: El Monte St, South Hill, The Bluffs, The Columbia Crest Marina