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

The community of Rock Island is the Seat for Rock Island County.

Rock Island County was founded in 1831 and was created by taking area from Jo DaviessCounty.

From the Census Estimates for 2009, <1> Rock Island had a population of 146,826 people. This is a decrease of 1.71% since the last Census (which gave a population of 149,374 people in 2000).

At the time of the 2000 Census, Rock Island represented 1.2% of the total population of Illinois, making it the state's 14th 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
2010147,546-1.22%+0.49% since 2009
2009146,826-1.71%+0.11% since 2008
2008146,661-1.82%-0.28% since 2007
2007147,071-1.54% 
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2000149,374The Last Census

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

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

Community 2009
Population
2000
Population
Change
(2009vs. 2000)
Moline   43,05043,7681.64% decrease  
Rock Island   38,08439,6844.03% decrease  
East Moline   20,86720,3332.63% increase  
Silvis   7,7597,2696.74% increase  
Milan   5,1955,3482.86% decrease  

Websites for Rock Island County

Official Website:   www.co.rock-island.il.us/

If you know of a history or genealogy society whose interest includes Rock Island 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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