Umatilla County, Oregon
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Stafford Hansell Government Center in Hermiston
Location within the U.S. state of Oregon
Oregon's location within the U.S.
|Founded||September 27, 1862|
|• Total||3,231 sq mi (8,370 km2)|
|• Land||3,216 sq mi (8,330 km2)|
|• Water||16 sq mi (40 km2) 0.5%%|
| • Estimate |
|• Density||20/sq mi (9/km2)|
|Time zone||UTC−8 (Pacific)|
|• Summer (DST)||UTC−7 (PDT)|
Umatilla County (//) is a county in the U.S. state of Oregon. The county seat is Umatilla. In 2005, 73,878 people lived there.  The county includes 3,231 square miles (8,369 km2) of which 3,215 is land and the rest is water.