Lucas Avenue Industrial Historic District is an American historic district bounded by Washington, Delmar, 20th & 21 Streets, St. Louis, Missouri. It was added to the National Register of Historic Places in 2000. A boundary increase, roughly bounded by Locust St., Delmar, and 19th and 20th Sts. was added in 2007. Included in the boundary increase are a warehouse, a manufacturing facility and a communications facility.