Leavenworth is the largest city in and the county seat of Leavenworth County, Kansas, United States. As of the 2010 census, the city population was 35,251. Located on the west bank of the Missouri River 25 mi (40 km) northwest of Kansas City, Missouri, it is part of the Kansas City metropolitan area.
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. It is important in nineteenth-century African-American history. During the American Civil War, many volunteers joined the Union Army from Leavenworth. It was the destination of numerous African-American refugee slaves who escaped from Missouri and other slave states.
The city has been notable as the location of several prisons, particularly the United States Disciplinary Barracks and United States Penitentiary, Leavenworth.
Located in northeastern Kansas at the junction of U.S. Route 73 and Kansas Highway 92 (K-92), Leavenworth is 25 mi (40 km) northwest of downtown Kansas City, 145 mi (233 km) south-southeast of Omaha, and 165 mi (266 km) northeast of Wichita.
As of the 2010 United States Census, there were 35,251 people, 12,256 households, and 8,129 families residing in the city. The population density was 1,466.2 people per square mile (566.1/km²). There were 13,670 housing units at an average density of 568.6 per square mile (219.5/km²).
There were 12,256 households of which 34.6% had children under the age of 18 living with them, 48.7% were married couples living together, 13.2% had a female householder with no husband present, 4.4% had a male householder with no wife present, and 33.7% were non-families. 28.7% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.55, and the average family size was 3.15.
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