Umatilla County
| Umatilla County, Oregon | |
|---|---|
Stafford Hansell Government Center in Hermiston
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 Location in the U.S. state of Oregon |
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 Oregon's location in the U.S. |
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| Founded | September 27, 1862 |
| Seat | Pendleton |
| Largest city | Hermiston |
| Area | |
| • Total | 3,231 sq mi (8,368 km2) |
| • Land | 3,216 sq mi (8,329 km2) |
| • Water | 16 sq mi (41 km2), 0.5% |
| Population (est.) | |
| • (2016) | 76,456 |
| • Density | 23/sq mi (9/km²) |
| Congressional district | 2nd |
| Time zone | Pacific: UTC-8/-7 |
| Website | www |
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.
Umatilla County is part of the Hermiston-Pendleton, OR Micropolitan Statistical Area.Portland State University projects that 80% of all growth in the MSA will occur in the immediate Hermiston vicinity between 2016 and 2035. It is included in the eight-county definition of Eastern Oregon.
Umatilla County was created on September 27, 1862, out of a portion of Wasco County. Adjustments were made to the county's boundaries following the creation of Grant, Morrow, Union, and Wallowa Counties. This legislative act also designated Marshall Station as the temporary county seat. An 1865 election selected Umatilla City, now known as Umatilla, as the county seat. With the development of wheat farming, population shifted to the north and east parts of the county, and a subsequent election in 1868 moved the county seat again to Pendleton.
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