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The 2000 Census showed that Westmoreland County had a population of 369,993 people. This represented 3.01% of the total population of Pennsylvania, making it the state's 10th most populous county (out of 67 counties).

From the Census Estimates for 2009<1>, Westmoreland had a population of 362,251 people. This is a decrease of 2.09% 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
2010365,169-1.3%+0.81% since 2009
2009362,251-2.09%-0.1% since 2008
2008362,627-1.99%-0.14% since 2007
2007363,131-1.85%-0.14% since 2006
2006363,645-1.72%-0.22% since 2005
2005364,458-1.5%-0.24% since 2004
2004365,325-1.26%-0.27% since 2003
2003366,332-0.99%-0.14% since 2002
2002366,836-0.85%-0.4% since 2001
2001368,313-0.45%-0.45% since 2000
2000369,993The Last Census

Westmoreland County had 161,058 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Westmoreland County has a total area<3> of 1,036 square miles [2,684 km²]. Of this total, 1,025 square miles [2,655 km²] of the area is land, with the balance (1.05%) being water (10.86 square miles [28.12 km²]).

Using the above population and land area values, Westmoreland County had a population density of 360.8 people per square mile [139.3 people/km²], making it the state's 16th 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 Westmoreland County is available. The QuickFact also contains a comparison between Westmoreland and the state of Pennsylvania.

Click here for the Westmoreland County QuickFact (QF-42129).

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

(2009 Est)
(2000 Census)
Change in
New KensingtonQF-425373613,61614,701-7.38%
Lower BurrellQF-424486412,06912,608-4.28%

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

(2009 Est.)
(2000 Census)
Change in
AlleghenyQF-42003   W1,218,4941,281,666-4.93%
ArmstrongQF-42005   N67,85172,392-6.27%
ButlerQF-42019   NW184,694174,0836.1%
CambriaQF-42021   E143,998152,598-5.64%
FayetteQF-42051   S142,605148,644-4.06%
IndianaQF-42063   NE87,45089,605-2.4%
SomersetQF-42111   SE76,95380,023-3.84%

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U.S. Census Bureau
Census QuickFact for Westmoreland 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 Westmoreland. 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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