Umatilla County, Oregon

Umatilla County
County
Stafford Hansell Government Center in Hermiston
Location within the U.S. state of Oregon
Oregon's location within the U.S.
Coordinates: 45°22′30″N 118°45′05″W
Country	United States
State	Oregon
Founded	September 27, 1862
Named for	Umatilla River
Seat	Pendleton
Largest city	Hermiston
Area
• Total	3,231 sq mi (8,370 km2)
• Land	3,216 sq mi (8,330 km2)
• Water	16 sq mi (40 km2)  0.5%
Population  (2020)
• Total	80,075
• Density	20/sq mi (9/km2)
Time zone	UTC−8 (Pacific)
• Summer (DST)	UTC−7 (PDT)
Congressional district	2nd
Website	www.co.umatilla.or.us

Umatilla County (/ˌjuːməˈtɪlə/) is a county in the U.S. state of Oregon. The county seat is Umatilla. In 2020, 80,075 people lived there. The county includes 3,231 square miles (8,369 km²) of which 3,215 is land and the rest is water.