What is the population of McHenry County, IL?
McHenry County in Illinois has a population of 311,366, per Census ACS 5-Year estimates. The median household income is $102,836 and the median age is 40.4.
Context
Counties are the primary administrative subdivisions of states and a stable unit for tracking population. McHenry County's population reflects everyone within county lines, including residents of incorporated cities and unincorporated areas.
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McHenry County in Illinois has a population of 311,366, per Census ACS 5-Year estimates. The median household income is $102,836 and the median age is 40.4.