Time Zone: Cook County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.
The community of Chicago is the Seat for Cook County.
Cook County was founded in 1831 and was created by taking area from PutnamCounty.
From the Census Estimates for 2009, <1> Cook had a population of 5,287,037 people. This is a decrease of 1.67% since the last Census (which gave a population of 5,376,741 people in 2000).
At the time of the 2000 Census, Cook represented 43.29% of the total population of Illinois, making it the state's 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.
Year | Population | Change Since 2000 | Year-to-Year Change |
2010 | 5,194,675 | -3.39% | -1.75% since 2009 |
2009 | 5,287,037 | -1.67% | +0.58% since 2008 |
2008 | 5,256,705 | -2.23% | +0.4% since 2007 |
2007 | 5,235,762 | -2.62% | |
--- | | | 2000 | 5,376,741 | The Last Census |
More information can be found on the Cook County Census Page for Cook County. .
Below are some of the communities located in Cook County (for more communities, please visit our Nearby Page for Cook County):
Community | 2009 Population | 2000 Population | Change (2009vs. 2000) |
Chicago | 2,851,268 | 2,896,016 | 1.55% decrease |
Elgin | 107,519 | 94,487 | 13.79% increase |
Cicero | 80,100 | 85,616 | 6.44% decrease |
Evanston | 77,857 | 74,239 | 4.87% increase |
Arlington Heights | 73,153 | 76,031 | 3.79% decrease |
Websites for Cook County
If you know of a history or genealogy society whose interest includes Cook 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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