Leavenworth County
County
Leavenworth County Courthouse in Leavenworth
Location within the U.S. state of Kansas
Kansas's location within the U.S.
Coordinates: 39°16′07″N 95°07′32″W / 39.2686°N 95.1256°W / 39.2686; -95.1256
Country	United States
State	Kansas
Founded	August 25, 1855
Named for	Henry Leavenworth
Seat	Leavenworth
Largest city	Leavenworth
Area
• Total	469 sq mi (1,210 km2)
• Land	463 sq mi (1,200 km2)
• Water	6.1 sq mi (16 km2)  1.3%
Population  (2020)[1]
• Total	81,881
• Estimate  (2023)[2]	83,518
• Density	176.8/sq mi (68.3/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	2nd
Website	leavenworthcounty.gov

Leavenworth County is a county located in the U.S. state of Kansas and is part of the Kansas City metropolitan area.^[3] Its county seat and most populous city is Leavenworth.^[4] As of the 2020 census, the county population was 81,881.^[1] The county was named after Henry Leavenworth, a general in the Indian Wars who established Fort Leavenworth.

For many millennia, the Great Plains of North America was inhabited by nomadic Native Americans. From the 16th century to 18th century, the Kingdom of France claimed ownership of large parts of North America. In 1762, after the French and Indian War, France secretly ceded New France to Spain, per the Treaty of Fontainebleau.

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.^[5]

Leavenworth County had the first Kansas State University extension agent in the State.

According to the United States Census Bureau, the county has a total area of 469 square miles (1,210 km²), of which 463 square miles (1,200 km²) is land and 6.1 square miles (16 km²) (1.3%) is water.^[6] It is the fifth-smallest county in Kansas by total area.

This county's watershed connects with both the Kansas River basin on the south via Stranger Creek and has a Missouri River port city to the east.^[7][8]

• Platte County, Missouri (north)
• Wyandotte County (east)
• Johnson County (southeast)
• Douglas County (southwest)
• Jefferson County (west)
• Atchison County (northwest)

The county is a part of the Kansas City, MO-KS Metropolitan Statistical Area.

As of the census of 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 people/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.

In the county, the population was spread out, with 26.7% under the age of 18, 8.2% from 18 to 24, 33.0% from 25 to 44, 22.2% from 45 to 64, and 9.8% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 113.50 males. For every 100 females age 18 and over, there were 116.90 males.

The median income for a household in the county was $48,114, and the median income for a family was $55,805. Males had a median income of $40,047 versus $26,029 for females. The per capita income for the county was $20,292. About 4.8% of families and 6.7% of the population were below the poverty line, including 8.8% of those under age 18 and 7.5% of those age 65 or over.

Leavenworth County was a prohibition, or "dry", county until the Kansas Constitution was amended in 1986 and voters approved the sale of alcoholic liquor by the individual drink with a 30 percent food sales requirement.^[15]

The county voted "No" on the 2022 Kansas abortion referendum, an anti-abortion ballot measure, by 59% to 41% despite backing Donald Trump with 59% of the vote to Joe Biden's 38% in the 2020 presidential election.^[16]

• United States Army Command and General Staff College
• University of Saint Mary
• Leavenworth Normal School (closed)

School districts include:^[17]

List of townships / incorporated cities / unincorporated communities / extinct former communities within Leavenworth County.^[21]

‡ means a community has portions in an adjacent county.

• Delaware City

Leavenworth County is divided into ten townships. The cities of Lansing and Leavenworth are considered governmentally independent and are excluded from the census figures for the townships. In the following table, the population center is the largest city (or cities) included in that township's population total, if it is of a significant size.

• Sean Malto, professional skateboarder
• Wayne Simien, professional basketball player

• National Register of Historic Places listings in Leavenworth County, Kansas
• Lenape & Christian Munsee
• Ernest Fox Nichols - Educator & MIT physicist
• Fort Leavenworth (Frontier Army Museum)
• Freedom's Frontier, NE Kansas National Heritage Area
• Kansas Sampler, shares insights on community character

Community information for Kansas

• Kansas locations by per capita income
• List of counties in Kansas
• List of townships in Kansas
• List of cities in Kansas
• List of unincorporated communities in Kansas
• List of ghost towns in Kansas

• History of Leavenworth County Kansas; Jesse Hall and LeRoy Hand; Historical Publishing; 684 pages; 1921.
• Standard Atlas of Leavenworth County, Kansas; Geo. A. Ogle & Co; 42 pages; 1903.
• Atlas Map of Leavenworth County, Kansas; Missouri Publishing Co; 38 pages; 1878.

Wikimedia Commons has media related to Leavenworth County, Kansas.

Wikisource has the text of an 1879 American Cyclopædia article about Leavenworth County, Kansas.

County

• Leavenworth County - Official
• Leavenworth County - Directory of Public Officials

Maps

• Leavenworth County Maps: Current, Historic, KDOT
• Kansas Highway Maps: Current, Historic, KDOT
• Kansas Railroad Maps: Current, 1996, 1915, KDOT and Kansas Historical Society

39°14′N 95°02′W / 39.233°N 95.033°W / 39.233; -95.033