Vernon is a town within Vernon Township and the county seat of Jennings County, Indiana, United States. With a population of 318 in the 2010 census, it is the smallest town with that designation in the state of Indiana, lying just south of the much larger North Vernon. It is nearly surrounded by the Muscatatuck River. Vernon is the only Indiana town with an elected mayor and an elected town marshal. As of 2023, Marshall Zamora is the mayor and Britt Burgmeier is the marshal.