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The 2000 Census showed that Butler County had a population of 174,083 people. This represented 1.42% of the total population of Pennsylvania, making it the state's 20th most populous county (out of 67 counties).

From the Census Estimates for 2009<1>, Butler had a population of 184,694 people. This is an increase of 6.1% since the 2000 Census.

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
2007182,488+4.83%+0.45% since 2006
2006181,676+4.36%+0.89% since 2005
2005180,074+3.44%+0.37% since 2004
2004179,405+3.06%+0.41% since 2003
2003178,664+2.63%+0.65% since 2002
2002177,504+1.97%+0.94% since 2001
2001175,847+1.01%+1.01% since 2000
2000174,083The Last Census

Butler County had 69,868 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Butler County has a total area<3> of 794 square miles [2,058 km²]. Of this total, only a minor amount of that area is covered by water (6.26 square miles [16.2 km²]).

Using the above population and land area values, Butler County had a population density of 220.8 people per square mile [85.2 people/km²], making it the state's 25th most densely populated county (out of 67 counties).

US Census QuickFacts

The Census Bureau has created documents containing demographic information that are called QuickFacts. A QuickFact that is specific to Butler County is available. The QuickFact also contains a comparison between Butler and the state of Pennsylvania.

Click here for the Butler County QuickFact (QF-42019).

Below are some of the communities that are located in Butler County:

(2009 Est)
(2000 Census)
Change in

Below are the counties that adjoin and form the boundaries of Butler County. A link to their specific Census QuickFact has been provided.

(2009 Est.)
(2000 Census)
Change in
AlleghenyQF-42003   S1,218,4941,281,666-4.93%
ArmstrongQF-42005   E67,85172,392-6.27%
BeaverQF-42007   SW171,673181,412-5.37%
ClarionQF-42031   NE39,47941,765-5.47%
LawrenceQF-42073   W90,16094,643-4.74%
MercerQF-42085   NW116,071120,293-3.51%
VenangoQF-42121   N54,18357,565-5.88%
WestmorelandQF-42129   SE362,251369,993-2.09%

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U.S. Census Bureau
Census QuickFact for Butler County

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>A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).

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<3>The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Butler. The value given by the Census Bureau reflects their statistical (or sampling) requirements.

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<4>All Quarter-dollar coin images from the United States Mint.

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