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Time Zone: Mercer County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

The community of Mercer is the Seat for Mercer County.

Mercer County was founded March 12, 1800 and was created by taking area from AlleghenyCounty.

From the Census Estimates for 2009, <1> Mercer had a population of 116,071 people. This is a decrease of 3.51% since the last Census (which gave a population of 120,293 people in 2000).

At the time of the 2000 Census, Mercer represented 0.98% of the total population of Pennsylvania, making it the state's 29th most populous county (out of 67 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
2010116,638-3.04%+0.49% since 2009
2009116,071-3.51%-0.5% since 2008
2008116,660-3.02%-0.4% since 2007
2007117,133-2.63% 
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2000120,293The Last Census

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

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

Community 2009
Population
2000
Population
Change
(2009vs. 2000)
Hermitage   16,18216,1570.15% increase  
Sharon   14,74616,3289.69% decrease  
Grove City   7,6658,0244.47% decrease  
Greenville   6,0556,3805.09% decrease  
Farrell   5,6946,0505.88% decrease  

Websites for Mercer County

Official Website:   www.mcc.co.mercer.pa.us/

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