Leavenworth, Kansas

Leavenworth, Kansas
Downtown Leavenworth (2014)
Motto: 
First City of Kansas
Location within Leavenworth County and Kansas
KDOT map of Leavenworth County (legend)
Coordinates: 39°19′22″N 94°55′27″W / 39.32278°N 94.92417°W / 39.32278; -94.92417
CountryUnited States
StateKansas
CountyLeavenworth
Founded1854
Incorporated1855
Government
 • TypeCommission-Manager
 • MayorNancy Bauder
 • City ManagerScott Peterson
Area
 • Total
24.31 sq mi (62.95 km2)
 • Land24.24 sq mi (62.79 km2)
 • Water0.062 sq mi (0.16 km2)
Elevation
840 ft (260 m)
Population
 (2020)
 • Total
37,351
 • Density1,541/sq mi (594.9/km2)
Time zoneUTC-6 (CST)
 • Summer (DST)UTC-5 (CDT)
ZIP codes
66043, 66048
Area code913
GNIS ID485610
Websiteleavenworthks.org

Leavenworth (/ˈlɛvənˌwɜːrθ/) is the county seat of and the largest city in Leavenworth County, Kansas, United States. Part of the Kansas City metropolitan area, Leavenworth is located on the west bank of the Missouri River, on the site of Fort Leavenworth, built in 1827. The city became known in American history for its role as a key supply base in the settlement of the American West. During the Civil War, many volunteers joined the Union Army from Leavenworth. The city has been notable as the location of several prisons, particularly the United States Disciplinary Barracks and United States Penitentiary, Leavenworth. As of the 2020 census, the population of the city was 37,351.