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McHenry County, Illinois

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McHenry County, Illinois
WoodstockILCourtHJail — CC BY-SA 3.0, Carldaniel · source

About McHenry County

McHenry County is located in the U.S. state of Illinois. According to the 2020 Census, it had a population of 310,229, making it the sixth-most populous county in Illinois. Its county seat is Woodstock. McHenry County is one of the five Illinois collar counties in the Chicago metropolitan area. Long known as a center of recreation along with agriculture in the western portion, it has recently experienced rapid rates of suburbanization, exurbanization and urbanization, but the western segment of the county remains primarily agricultural and rural.

Description adapted from Wikipedia, CC BY-SA 4.0.

McHenry County at a glance

County seat
Woodstock
Population
310,229 (2020)
Land area
603 sq mi
Founded
1836

Largest communities in McHenry County

  1. Algonquin Township87,633
  2. Grafton Township56,446
  3. McHenry Township46,268
  4. Crystal Lake40,269
  5. Nunda Township38,344

History of McHenry County

McHenry County was formed in 1836 out of Cook and LaSalle counties. The county was named for Major William McHenry, a member of the Illinois Militia during Tecumseh's War, a major during the Blackhawk War in 1832, and a member of the Illinois House of Representatives and Senate. He died in Vandalia, Illinois in 1835. McHenry County originally stretched all the way east to Lake Michigan, with the county seat centrally in McHenry, but in 1839, the eastern townships of the county were carved out forming Lake County.

Adapted from Wikipedia, CC BY-SA 4.0.

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Part of Illinois Voter Check

This is the McHenry County page of Illinois Voter Check, a project of True the Vote, pointing Illinois voters at the official tools that already exist — and at Scan Check Protect to verify your registration.

Where anything here differs from what McHenry County or the Illinois State Board of Elections publishes, they are right and this page is not.