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Polk County, Oregon

Polk County, Oregon
Polk County Courthouse, Dallas, Oregon (180924761).jpg
Polk County Courthouse in Dallas
Map of Oregon highlighting Polk County
Location in the U.S. state of Oregon
Map of the United States highlighting Oregon
Oregon's location in the U.S.
Founded December 22, 1845
Seat Dallas
Largest city Dallas
Area
 • Total 744 sq mi (1,927 km2)
 • Land 741 sq mi (1,919 km2)
 • Water 3.1 sq mi (8 km2), 0.4%
Population (est.)
 • (2015) 79,391
 • Density 102/sq mi (39/km²)
Congressional district 5th
Time zone Pacific: UTC-8/-7
Website www.co.polk.or.us

Polk County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 75,403. The county seat is Dallas. The county is named for James Knox Polk, the 11th president of the United States.

Polk County is part of the Salem, OR Metropolitan Statistical Area, which is also included in the Portland-Vancouver-Salem, OR-WA Combined Statistical Area. It is located in the Willamette Valley.

The Oregon Provisional Legislature created Polk County from Yamhill District on December 22, 1845, granting to it the entire southwestern portion of present-day Oregon to the California border. County boundaries were periodically changed to reflect the creation of Benton and Lincoln counties. Many other counties were subsequently carved out of these as settlement spread towards the south, leaving Polk County many counties away from its former border with California.

The first county seat was a settlement on the north side of Rickreall Creek named Cynthian (also known as Cynthia Ann). In 1852 city officials renamed Cynthian to Dallas after Vice President George M. Dallas, vice president (1845-1849) to James Polk. During the 1880s and 1890s, there were a series of unsuccessful efforts to move the county seat to nearby Independence.


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