McHenry County, Illinois

18 ZIP codes · 603.4 sq mi of land · FIPS 17111

Population	312,591
State	Illinois
FIPS code	17111
Time zone	Central
Land area	603.4 sq mi
Center (lat, long)	42.3243, -88.4522

Area codes in this area

224 779 815 847

These are the area codes that most often serve McHenry County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Cities and towns (largest first)

Crystal Lake · 40,579 Algonquin · 30,067 Huntley · 28,005 Woodstock · 26,147 Cary · 17,923Fox River GroveHarvardHebronMchenryRichmondRingwoodSpring GroveWonder LakeMarengoLake In The HillsUnion

ZIP codes in McHenry County

60012 Crystal Lake 60013 Cary 60014 Crystal Lake 60021 Fox River Grove 60033 Harvard 60034 Hebron 60050 Mchenry 60051 Mchenry 60071 Richmond 60072 Ringwood 60081 Spring Grove 60097 Wonder Lake 60098 Woodstock 60102 Algonquin 60142 Huntley 60152 Marengo 60156 Lake In The Hills 60180 Union

Population: U.S. Census Bureau, ACS 5-year estimates, 2024.