DDI Media is a family-owned billboard and digital media advertising company based in the Greater St. Louis, MO metropolitan area. In Jefferson County, DDI Media operates 133 billboard advertising faces.
The northern border of Jefferson County closely follows the Meramec River, while the eastern border follows the Mississippi River. Jefferson County is surrounded by St. Louis County to the north and Franklin County to the west. Saint Genevieve County, St. Francois County, and Washington County border Jefferson County to the southeast, south, and southwest, respectively.
Jefferson County's major thoroughfare is Interstate 55, which runs north and south from Chicago, Illinois, to the Gulf of Mexico. DDI Media has billboard inventory along I-55 and other major routes including Highway 141, Highway 30, and Highway 61/67.