Facts & Demographics

Polk County Map


  • Polk County was founded on Dec. 22, 1845
  • The County was named for James Knox Polk, the 11th President of the United States
  • The County seat is located at Dallas, Oregon
  • Polk County is home to Western Oregon University and an excellent public school system
  • Polk County is governed by a 3-member Board of Commissioners who serve 4-year terms
  • Polk County is a blend of both rural and urban communities, and operates under a detailed Comprehensive Land Use Plan




  • Polk County is located in the heart of the lush Willamette Valley, approximately 15 miles west of Salem, Oregon
  • Residents enjoy a moderate, four season climate with an average of 222 days of sunshine and an average of 52 inches of precipitation each year
  • August is the warmest month (Avg. High: 81)
  • January is the coolest month (Avg. High: 39)

Geography Quick Facts

  • Land Area: 744 square miles
  • Persons per Square Mile: 102
  • Statistical Area: Salem Metropolitan Area


  • Population: 79,122 (2010 Census)
  • Population Increase 2000 - 2009: 25.2%
  • Estimated Housing Units: 27,857
  • Median Household Income: $53,506