Lansing is a city in Leavenworth County, Kansas, United States.  It is situated along the west side of the Missouri River and Kansas-Missouri state border.  As of the 2020 census, the population of the city was 11,239.  It is the second most populous city of Leavenworth County and is a part of the Kansas City metropolitan area.  The Lansing Correctional Facility (formerly the Kansas State Penitentiary), which includes the state's main maximum-security prison, is located in Lansing.


The city was named after Lansing, Michigan. The first post office in Lansing was established in 1858.
Lansing is located at (39.038452, -94.566404). According to the United States Census Bureau, the city has a total area of , of which is land and is water.

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