County · Illinois · United States
McHenry County ZIP codes
18 ZIP codes · 16 cities · FIPS 17111
Key facts
- State
- Illinois (IL)
- FIPS code
- 17111
- Population
- 311,366
- Median household income
- $102,836
- Median age
- 40.4
- Land area
- 603.4 sq mi (1,562.8 km²)
- Population density
- 516 / sq mi
- Area codes
- 224, 779, 815, 847
Cities and ZIP codes in McHenry County (16)
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.