This is the first right hand read billboard entering St. Charles County. St. Charles County, with a population of 360,485, has been one of the fastest-growing counties in the country for decades. Nightly traffic jams for westbound commuters heading home to the affluent bedroom communities are the norm. Attractions in the vicinity of this location include the Ameristar Casino, Hollywood Casino, St. Charles Convention Center, Historic Main Street, Bass Pro, Dave & Busters, Casino Queen and two nearby banquet centers.