This unit reaches traffic exiting St. Charles County for St. Louis County. St. Charles County, with a population of 360,485, has been one of the fastest-growing counties in the country for decades. Morning traffic jams are the norm for eastbound commuters heading to work from the affluent bedroom communities. Attractions in the vicinity of this location include The Ameristar Casino, Hollywood Casino, St. Charles Convention Center, Historic Main Street, Bass Pro, Dave & Busters, Hollywood Casino and two nearby banquet centers.