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Cowlitz County

Founded: April 21, 1854

Cowlitz County
Sheriff's Office

312 SW 1st Avenue
Kelso, WA 98626

Phone: 360.577.3092
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Cowlitz County forms the Longview, Washington Metropolitan Statistical Area which encompasses all of Cowlitz County. As of July 2017 the estimated population was 106,910. The county seat is at Kelso, and its largest city is Longview. Its name derives from a Cowlitz word meaning "seeker" (in a spiritual sense).

It was formed on April 21, 1854.

According to the U.S. Census Bureau, the county has a total area of 1,166 square miles, of which, 1,139 square miles of it is land and 28 square miles of it (2.37%) is water. The population density is 83 per square mile.


Principal Communities:
  • Castle Rock
  • Kalama
  • Kelso (County Seat)
  • Longview
  • Woodland

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Sheriff Bradley Thurman
Took Office: January 1, 2019

Employees: 54
Budget: $4.9 million

Cowlitz County Hall of Justice
County Seat: