Columbia County is located in the U.S. state of Oregon. The county seat is St. Helens. The county was named for the Columbia River, which forms its eastern and northern borders.

Columbia County is part of the Portland-Vancouver-Hillsboro, OR-WA Metropolitan Statistical Area.

The county government is composed of a Board of Commissioners, elected from three districts within the county. The Board is responsible for setting policy and budgeting for the county. The county is also served by a number of elected officials, including a Sheriff, District Attorney, Assessor, Clerk, Treasurer, and Surveyor.

The county is home to several state parks, including Fort Stevens State Park, Lewis and Clark National Historical Park, and Columbia Hills State Park. The county also has several recreational areas, including Scappoose Bay, the Columbia River Gorge, and the Willamette River.

For the most up-to-date and in-depth information, please check the public records links below.