Somerset Township is one of sixteen townships in Jackson County, Illinois, USA. As of the 2010 census, its population was 4,205 and it contained 1,886 housing units.

Jackson County is a county located in the U.S. state of Illinois with a population of 52,974 at the 2020 census. Its county seat is Murphysboro, and its most populous city is Carbondale, home to the main campus of Southern Illinois University. The county was incorporated on January 10, 1816, and named for Andrew Jackson. The community of Brownsville served as the fledgling county's first seat.