Washington County Rhode Island (Vacant / Not In Use) has 12 places on the National Register of Historic Places including 2 places of National significance and 4 places of Statewide significance. Significant places include Block Island North Light, Historic Village of the Narragansetts in Charlestown, Lawton's Mill, Narragansett Baptist Church and Plum Beach Lighthouse.
Some of the country's most noteable architects helped create the Washington County places including Thomas A. Tefft, Walsh,J.C.,Company, Walker,William R.,& Son, Douglas Smyth and Nardone Construction. Prominent architectural styles found in Washington Country are Federal, Romanesque and Early Commercial.