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The Commemorative
Quarter for
The Commemorative Quarter for Illinois

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

The community of Aledo is the Seat for Mercer County.

Mercer County was founded in 1825 and was created by taking area from SchuylerCounty.

From the Census Estimates for 2009, <1> Mercer had a population of 16,276 people. This is a decrease of 4.02% since the last Census (which gave a population of 16,957 people in 2000).

At the time of the 2000 Census, Mercer represented 0.14% of the total population of Illinois, making it the state's 68th 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.

Since 2000
Year-to-Year Change
201016,434-3.08%+0.97% since 2009
200916,276-4.02%-1.15% since 2008
200816,465-2.9%+0.22% since 2007
200016,957The Last Census

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


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

Community 2009
(2009vs. 2000)
Aledo   3,5123,6132.8% decrease  
Viola   9159564.29% decrease  
Alexis   7918638.34% decrease  
Matherville   7397724.27% decrease  
Keithsburg   6847144.2% decrease  

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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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