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

The community of Butler is the Seat for Butler County.

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

From the Census Estimates for 2009, <1> Butler had a population of 184,694 people. This is an increase of 6.1% since the last Census (which gave a population of 174,083 people in 2000).

At the time of the 2000 Census, Butler represented 1.42% of the total population of Pennsylvania, making it the state's 20th 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.

Since 2000
Year-to-Year Change
2010183,862+5.62%-0.45% since 2009
2009184,694+6.1%+0.56% since 2008
2008183,663+5.5%+0.64% since 2007
2000174,083The Last Census

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


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

Community 2009
(2009vs. 2000)
Butler   13,95615,1217.7% decrease  
Zelienople   3,9544,1234.1% decrease  
Slippery Rock   2,9523,0683.78% decrease  
Seven Fields   2,5431,98628.05% increase  
Evans City   1,8892,0095.97% decrease  

Websites for Butler County

Official Website:   www.co.butler.pa.us/

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