Spanish Town is a historic district anchored by Spanish Town Road in Baton Rouge, the capital city of the U.S. state of Louisiana. It is well known for its annual Mardi Gras parade, which is the largest in Baton Rouge. Spanish Town was commissioned in 1805. It is the oldest neighborhood in Baton Rouge, and its 49.4 acres area, comprising 258 contributing properties, was added to the National Register of Historic Places on August 31, 1978.