McHenry County, Illinois
McHenry County is a county in Illinois. Its county FIPS code is 17111. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 17111
- Representative coordinates
- 42.324298, -88.452245
- County type
- County
- County seat or government
- Woodstock
- Resident population, July 2025
- 317,751
- Land area
- 1,562.806 km²
- Water area
- 19.856 km²
- State
- Illinois
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in McHenry County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
60010 · 60012 · 60013 · 60014 · 60020 · 60021 · 60033 · 60034 · 60042 · 60050 · 60051 · 60071 · 60072 · 60081 · 60097 · 60098 · 60102 · 60135 · 60140 · 60142 · 60152 · 60156 · 60180 · 61038
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
McHenry County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Alden CDP, IL
- Algonquin village, IL
- Barrington Hills village, IL
- Big Foot Prairie CDP, IL
- Bull Valley village, IL
- Burtons Bridge CDP, IL
- Cary village, IL
- Chemung CDP, IL
- Coral CDP, IL
- Crystal Lake city, IL
- Fox Lake village, IL
- Fox River Grove village, IL
- Franklinville CDP, IL
- Greenwood village, IL
- Hampshire village, IL
- Harmony CDP, IL
- Hartland CDP, IL
- Harvard city, IL
- Hebron village, IL
- Holiday Hills village, IL
- Huntley village, IL
- Island Lake village, IL
- Johnsburg village, IL
- Lake in the Hills village, IL
- Lakemoor village, IL
- Lakewood village, IL
- Lawrence CDP, IL
- McCullom Lake village, IL
- McHenry city, IL
- Marengo city, IL
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county at your current point, check its ZIP area, or find its physical time zone.