McHenry County
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- Population
- 312,591
- Area
- 603.4 sq mi (1,562.79 km²), 7.67 sq mi water
- Median age
- 40.7
- Households
- 117,594
- Persons per household
- 2.6
- Median household income
- $104,802
- Median house value
- $308,100
Demographics: 2020–2024 ACS
Overnight
49°F
Isolated Rain Showers20% precip
Sunday
68°F
Sunny4% precip
Sunday Night
42°F
Clear
Monday
64°F
Sunny
Cities & Towns in McHenry County
AldenAlden TownshipAlgonquinAlgonquin TownshipBarrington HillsBig Foot PrairieBull ValleyBurton TownshipBurtons BridgeCaryChemungChemung TownshipCoralCoral TownshipCrystal LakeDorr TownshipDunham TownshipFox LakeFox River GroveFranklinvilleGrafton TownshipGreenwoodGreenwood TownshipHarmonyHartlandHartland TownshipHarvardHebronHebron TownshipHoliday HillsHuntleyIsland LakeJohnsburgLake in the HillsLakemoorLakewoodLawrenceMarengoMarengo TownshipMcCullom LakeMcHenryMcHenry TownshipNunda TownshipOakwood HillsPistakee HighlandsPort BarringtonPrairie GroveRichmondRichmond TownshipRidgefieldRileyRiley TownshipRingwoodSeneca TownshipSolon MillsSpring GroveTrout ValleyUnionWonder LakeWoodstock