Jefferson County, Missouri is governed by a 7-member governing board. The current county executive is Dennis Gannon. See all 26 named officeholders and how to reach each office.
Population: 233,132.
Selected officeholders: County Executive: Dennis Gannon · Council Member: Brian Haskins · Council Member: Billy Crow · Council Member: Lori Aronns · Council Member: Charles Groeteke · Council Member: Scott Seek.