6422 Main Street,
P.O. Box 434, Union, IL 60180
Phone: (815) 923-2267
The Museum is open May through the first Sunday in October; 1 to 4 p.m. Tuesday through Friday, as well as Sundays in May and on select Sundays June-September.
Research Library Hours
The library hours are 9 a.m to 4:30 p.m. Monday through Friday year round. An Appointment is required at least 24 hours in advance. Call 815-923-2267 for more information, and to schedule an appointment.
Society Office Hours
The Historical Society office is open year round, 9 a.m. to 4 p.m. Monday through Friday.
The Museum and Offices are closed New Year's Eve, New Year's Day, Good Friday, Memorial Day, Fourth of July, Labor Day, Columbus Day, Thanksgiving, Christmas Eve and Christmas.
The McHenry County Historical Society has a wide array of volunteer opportunities available for those who are interested.