The McHenry County Historical Society and Museum is located in Union, Illinois - a small town located southwest of Woodstock, roughly between Illinois Route 176 and U.S. Route 20 and between Illinois Route 47 and Marengo. Please refer to the map below for more detailed directions. If you require further assistance please feel free to contact the museum before your visit by calling (815) 923-2267 or e-mailing at info@mchsonline.org.