This left hand read billboard entering St. Charles County is located in the Streets of St. Charles (8 screen theater and numerous offices and restaurants. St. Charles County has been one of the fastest-growing counties in the country for decades. Daily traffic jams for commuters to and from the affluent bedroom communities are the norm. Attractions: Ameristar Casino, Hollywood Casino, St. Charles Convention Center, Historic Main Street, Bass Pro, Dave & Busters, Hollywood Casino Amphitheater.