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 16th 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 adjacent Callaway County.
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