24/7 Biohazard and Crime Scene Cleanup in Leavenworth, KS

Leavenworth is the county seat and largest city of Leavenworth County, and it proudly calls itself the "First City of Kansas."

Leavenworth was founded in 1854 as the very first city in Kansas, laid out just south of Fort Leavenworth shortly after the Kansas-Nebraska Act.

Leavenworth sits on the west bank of the Missouri River and is part of the Kansas City metropolitan area.

The 2020 census counted 37,351 people in Leavenworth, and Census QuickFacts counted 13,733 households there for 2020-2024, averaging 2.42 persons per household.

Fort Leavenworth, just north of the city, was founded by Colonel Henry Leavenworth in 1827 and is the oldest active U.S. Army post west of the Mississippi River.

Fort Leavenworth is known as the "Intellectual Center of the Army" and is home to the U.S. Army Command and General Staff College, founded there by General William T. Sherman in 1881, whose students and instructors have included Dwight D. Eisenhower, George C. Marshall, Douglas MacArthur, George Patton and Colin Powell.

The Rookery at Fort Leavenworth, built in 1832-1834, is the oldest building in Kansas and served as the first territorial capitol of Kansas in 1854-1855.

Leavenworth became nationally known as the "jumping off point" for the opening of the West, and Buffalo Bill Cody spent part of his youth there and later worked in the area as a Pony Express rider and Army scout.

The Sisters of Charity of Leavenworth settled in the city in 1858, opened St. John Hospital in 1864 and founded Saint Mary College in 1923, which is now the University of Saint Mary.

The first cell house of the Leavenworth Federal Penitentiary opened in 1906, and the prison later held notorious inmates including Robert Stroud, the "Birdman of Alcatraz," and George "Machine Gun" Kelly.