The Port of Columbia County is a special district in Columbia County, Oregon. The boundaries of the Port District span 51 miles along the Columbia River from the Clatsop County line in the northwest of Columbia County, to the Multnomah County line in the southeast, and includes the cities of Scappoose, St. Helens, Columbia City, Rainier, and Clatskanie. The Port was created in 1940 to promote economic development opportunities in the Port District, primarily through the lease and development of industrial property. Today, the Port owns 10 different property sites and 2,400 acres, including industrial properties with excellent highway, rail, airport, and maritime access.