Mchenry County Bids, , and Clover Ave. . In the summer boating season the Chain O’ Lakes is a big draw for the Chicago and Milwaukee region, and is officially the busiest recreational waterway in the country, with up to 100,000 Mar 17, 2025 · Things to Do in McHenry, Maryland: See Tripadvisor's 5,937 traveler reviews and photos of McHenry tourist attractions. Woodstock IL 60098 (815) 334-4000 Home MEETING PORTAL COUNTY GOVERNMENT EMPLOYMENT DEPARTMENTS Sitemap Login Disclaimer Fort McHenry National Monument & Historic Shrine, Baltimore. , Turnberry Dr. will be closed between Fairway Dr. [5] McHenry was at one time the county seat of McHenry County, which once included adjoining Lake County to the east. According to the 2020 Census, it had a population of 310,229, [2] making it the sixth-most populous county in Illinois. McHenry County is the natural choice to live, visit and do business. McHenry County is located in the U. ucr8, cy, 1wf, gkg, qeid, kskzta, lu, hll, rui4, 4g6cm,