Jefferson County was formed along with much of the other surrounding counties in 1818. It covers 664 square miles and has 15 large communities, such as Arnold, Festus and De Soto, within its boundaries.
Jefferson County Missouri is located south of St. Louis County with the Meramec River being part of the boundary between the two counties. Ste. Genevieve and St. Francois counties lie to the south of Jefferson County and Franklin and Washington counties lie to the west.
The residents of Jefferson County are served by ten public school districts which are Crystal City, De Soto, Dunklin, Festus, Fox, Grandview, Hillsboro, Jefferson County, Northwest and Windsor School Districts. There are also several private elementary and high schools located in the county as well. Jefferson College in Hillsboro and the Arnold campus of ITT Technical Institute are in Jefferson County, too.
Jefferson County has many historic sites and attractions that draw visitors from across the region. The historic town of Kimmswick is famous for the Blue Owl Restaurant and its many boutiques. Mastodon State Historic Site, an important archaeological and paleontological site for the entire nation, and the Sandy Creek Bridge State Historic Site, the location of one of the four remaining covered bridges that are still left in Missouri, are both in Jefferson County.
Below is a list of more communities, high schools, attractions, parks and other things that can be found in Jefferson County Missouri.