Lansing is a city situated along the Missouri River in the eastern part of Leavenworth County, located in northeast Kansas, in the Central United States. As of the 2010 census, the city population was 11,265. It is the second most populous city of Leavenworth County and is a part of the Kansas City metropolitan area.The Lansing Correctional Facility, which includes the state's main maximum-security prison, is located in Lansing.