McHenry County Map, Illinois

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McHenry County, Illinois

McHenry County sits in the far northeast corner of Illinois, right on the Wisconsin border. It’s part of the Chicago metro area, but it’s got a character all its own. You’ll find a mix of suburban neighborhoods and rural farmland here.

The Fox River cuts through the eastern part of the county, providing some great spots for fishing and boating. Crystal Lake is a popular town with a small-town feel and big-city amenities. The county’s changing fast. Lots of folks are moving in from Chicago, looking for more space.

But you can still find plenty of open land and family farms. Come here to explore places like Moraine Hills State Park. People here take pride in their communities. You’ll see it in the well-kept downtowns and farmers markets. It’s a place that’s holding onto its roots while embracing the future.

Category	Details
County Name	McHenry County
County Seat	Woodstock
Population	Approximately 320,000
Cities, Towns, and Communities	Crystal Lake, Algonquin, McHenry, Woodstock, Huntley, and several unincorporated communities
Interstates and Highways	Interstate 90, U.S. Highway 14, Illinois Route 31, Illinois Route 120
FIPS Code	17-111
Total Area (Land and Water)	611 square miles (land: 606 sq mi, water: 5 sq mi)
Adjacent Counties (and Direction)	Walworth County, Wisconsin (North), Kenosha County, Wisconsin (Northeast), Lake County (East), Cook County (Southeast), Kane County (South), DeKalb County (Southwest), Boone County (West)
Time Zone	Central Time Zone (CT)
State	Illinois
Coordinates	42.2674° N, 88.4491° W
Etymology	Named after Major William McHenry
Major Landmarks	The Old Courthouse in Woodstock, Crystal Lake, and the Fox River. The county is also known for its extensive natural preserves
Website	McHenry County Website