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Time Zone: McHenry County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Woodstock is the Seat for McHenry County.

McHenry County was founded in 1836 and was created by taking area from CookCounty.

From the Census Estimates for 2009, <1> McHenry had a population of 320,961 people. This is an increase of 23.41% since the last Census (which gave a population of 260,077 people in 2000).

At the time of the 2000 Census, McHenry represented 2.09% of the total population of Illinois, making it the state's 7th most populous county (out of 102 counties).

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

YearPopulationChange
Since 2000
Year-to-Year Change
2010308,760+18.72%-3.8% since 2009
2009320,961+23.41%+0.89% since 2008
2008318,118+22.32%+1.09% since 2007
2007314,696+21% 
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2000260,077The Last Census

More information can be found on the McHenry County Census Page for McHenry County.

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Below are some of the communities located in McHenry County (for more communities, please visit our Nearby Page for McHenry County):

Community 2009
Population
2000
Population
Change
(2009vs. 2000)
Crystal Lake   42,18038,00011% increase  
Lake-in-the-Hills   29,70423,15228.3% increase  
McHenry   27,16521,50126.34% increase  
Woodstock   24,33320,15120.75% increase  
Cary   19,65115,53126.53% increase  

Websites for McHenry County

Official Website:   www.co.mchenry.il.us/

If you know of a history or genealogy society whose interest includes McHenry County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.

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Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>All Quarter-dollar coin images from the United States Mint.

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