The Missouri State Penitentiary was a prison in Jefferson City, Missouri, that operated from 1836 to 2004. Part of the Missouri Department of Corrections, it served as the state of Missouri's primary maximum security institution. Before it closed, it was the oldest operating penal facility west of the Mississippi River. It was replaced by the Jefferson City Correctional Center, which opened on September 15, 2004.

Jefferson City, informally Jeff City, is the capital of the U.S. state of Missouri. It had a population of 43,228 at the 2020 census, ranking as the 15th most populous city in the state. It is also the county seat of Cole County and the principal city of the Jefferson City Metropolitan Statistical Area, the second-most-populous metropolitan area in Mid-Missouri and the fifth-largest in the state. Most of the city is in Cole County, with a small northern section extending into Callaway County. Jefferson City is named for Thomas Jefferson, the third President of the United States.