The U.S. Post Office and Courthouse-Aberdeen, in Aberdeen, South Dakota, was built in 1936 with Art Deco features. It is a steel-framed four-story rectangular building, 67 feet (20 m) tall on a 150 feet (46 m) by 64 feet (20 m) base, with a one-story 100 feet (30 m) by 64 feet (20 m) extension (part of the original). It was listed on the National Register of Historic Places in 2006. It served historically as a government office building, as a post office, and as a courthouse.