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The Commemorative Quarter for Pennsylvania

The 2000 Census showed that Allegheny County had a population of 1,281,666 people. This represented 10.44% of the total population of Pennsylvania, making it the state's 2nd most populous county (out of 67 counties).

From the Census Estimates for 2009<1>, Allegheny had a population of 1,218,494 people. This is a decrease of 4.93% 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.

YearPopulationChange
Since 2000
Year-to-Year Change
20101,223,348-4.55%+0.4% since 2009
20091,218,494-4.93% 
20081,218,227-4.95%-0.14% since 2007
20071,219,922-4.82%-0.27% since 2006
20061,223,239-4.56%-0.75% since 2005
20051,232,483-3.84%-1.07% since 2004
20041,245,875-2.79%-0.9% since 2003
20031,257,196-1.91%-0.65% since 2002
20021,265,422-1.27%-0.56% since 2001
20011,272,519-0.71%-0.71% since 2000
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20001,281,666The Last Census

Allegheny County had 583,646 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Allegheny County has a total area<3> of 744 square miles [1,928 km²]. Of this total, 730 square miles [1,891 km²] of the area is land, with the balance (1.95%) being water (14.54 square miles [37.65 km²]).

Using the above population and land area values, Allegheny County had a population density of 1,755 people per square mile [677 people/km²], making it the state's 3rd 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 Allegheny County is available. The QuickFact also contains a comparison between Allegheny and the state of Pennsylvania.

Click here for the Allegheny County QuickFact (QF-42003).

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

CommunityCensus
QuickFact
Population
(2009 Est)
Population
(2000 Census)
Change in
  Population
PittsburghQF-4261000311,647334,563-6.85%
Bethel ParkQF-420606431,54533,556-5.99%
MonroevilleQF-425052827,64329,349-5.81%
PlumQF-426153626,24926,940-2.56%
McKeesportQF-424625622,07624,040-8.17%
West MifflinQF-428351220,41822,464-9.11%
BaldwinQF-420392818,48719,999-7.56%
WilkinsburgQF-428518817,11219,196-10.86%
WhitehallQF-428451213,39714,444-7.25%
Franklin ParkQF-422755212,36811,3648.83%
Munhall TerraceQF-425232811,09212,264-9.56%
Jefferson HillsQF-42379559,8039,6661.42%
BrentwoodQF-42084169,51110,466-9.12%
SwissvaleQF-42758168,7609,653-9.25%
DormontQF-42195768,4519,305-9.18%
White OakQF-42847048,1178,437-3.79%
Castle ShannonQF-42116808,0808,556-5.56%
BellevueQF-42053128,0038,770-8.75%
Pleasant HillsQF-42613287,9828,397-4.94%
CarnegieQF-42113367,9348,389-5.42%

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

CountyCensus
QuickFact
DirectionPopulation
(2009 Est.)
Population
(2000 Census)
Change in
Population
ArmstrongQF-42005   NE67,85172,392-6.27%
BeaverQF-42007   NW171,673181,412-5.37%
ButlerQF-42019   N184,694174,0836.1%
WashingtonQF-42125   SW207,389202,8972.21%
WestmorelandQF-42129   E362,251369,993-2.09%

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U.S. Census Bureau
Census QuickFact for Allegheny 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 Allegheny. 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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