Andover is a city in Butler and Sedgwick counties in the U.S. state of Kansas. As of the 2000 census, the city population was 6,698. Located almost entirely in Butler County, it is part of the Wichita Metropolitan Statistical Area. Andover is well-known because of the tornado that hit the city in 1991. The city name is often confused with Andale, Kansas, a smaller city in western Sedgwick County. Andover has a satellite campus for the Butler County Community College.