Cowlitz County Washington (Historic Districts) has 2 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Lake Sacajawea Park and Longview Civic Center Historic District.
Some of the country's most noteable architects helped create the Cowlitz County places including S. Herbert Hare. Prominent architectural styles found in Cowlitz Country are Art Deco and Colonial Revival.