From a total population of 25,121, McHenry County has a median age of 35.6. The average age of males, in McHenry County, is 33.8 while the average age of females is 37.5. When you compare this to median age of Illinois, McHenry County is 1.4 years younger.
The median income of individuals, in McHenry County, is $28,558 while the average household income is $57,583. When comparing the median income of people living in McHenry County to the rest of Illinois, the average income in McHenry County is $1,461 less.