Imperial is a census-designated place (CDP) in Jefferson County, Missouri, United States. The estimated population in 2007 was 4,747. It was 4,373 at the 2000 census. It was originally known as West Kimmswick, and is roughly 25 driving minutes south of St. Louis. St. John's Church is a historic parish church located within Imperial.
Imperial is located at 38°22′15″N 90°22′24″W / 38.370735°N 90.373460°W / 38.370735; -90.373460.
Imperial, Missouri is located directly south of Arnold, Missouri and north of Barnhart, Missouri. Interstate 55 runs through Imperial. Mastodon State Historic Site is located in Imperial. Imperial, Missouri contains several local businesses including H.W. Herrell Distributing, Home Service Oil and Herrell's Market.