Fort Chartres 1350 State Route 155 Prairie Du Rchr, IL 62277 Phone : (618) 284-7230 Business Category Government Offices-State Historical Places & Services Amusement & Recreation Legislative Bodies State Of Illinois--fort Chartres Historic Site 1350 State Route 155 Prairie Du Rocher, IL 62277 Phone : (618) 284-7230 Business Category Government Offices-State Historical Places & Services Amusement & Recreation Government Offices State & Local Government Offices & Public Schools