Leavenworth County (county code LV) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 76,227. Its county seat and most populous city is Leavenworth.
In 1802, Spain returned most of the land to France, but keeping title to about 7,500 square miles. In 1803, most of the land for modern day Kansas was acquired by the United States from France as part of the 828,000 square mile Louisiana Purchase for 2.83 cents per acre.
In 1854, the Kansas Territory was organized, then in 1861 Kansas became the 34th U.S. state. In 1855, Leavenworth County was established, and is among the first 33 counties, which were formed by the first territorial government. It was named, as was its county seat, after Henry Leavenworth, an officer in the War of 1812.
Leavenworth County had the first Kansas State University extension agent in the State.
As of the U.S. Census in 2000, there were 68,691 people, 23,071 households, and 17,210 families residing in the county. The population density was 148 people per square mile (57/km²). There were 24,401 housing units at an average density of 53 per square mile (20/km²). The racial makeup of the county was 84.2% White, 10.4% Black or African American, 0.7% Native American, 1.1% Asian, 0.1% Pacific Islander, 1.2% from other races, and 2.2% from two or more races. Hispanic or Latino of any race were 3.8% of the population.
There were 23,071 households out of which 38.9% had children under the age of 18 living with them, 61.4% were married couples living together, 9.5% had a female householder with no husband present, and 25.4% were non-families. 21.7% of all households were made up of individuals and 8.1% had someone living alone who was 65 years of age or older. The average household size was 2.69 and the average family size was 3.15.
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