Learn About
The Commemorative
Quarter for
The Commemorative Quarter for Pennsylvania

The 2000 Census showed that Armstrong County had a population of 72,392 people. This represented 0.59% of the total population of Pennsylvania, making it the state's 38th most populous county (out of 67 counties).

From the Census Estimates for 2009<1>, Armstrong had a population of 67,851 people. This is a decrease of 6.27% 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
201068,941-4.77%+1.61% since 2009
200967,851-6.27%-0.87% since 2008
200868,449-5.45%-0.52% since 2007
200768,804-4.96%-0.44% since 2006
200669,106-4.54%-1.03% since 2005
200569,822-3.55%-1.36% since 2004
200470,784-2.22%-0.55% since 2003
200371,174-1.68%-0.39% since 2002
200271,455-1.29%-0.48% since 2001
200171,797-0.82%-0.82% since 2000
200072,392The Last Census

Armstrong County had 32,387 Housing Units<2> at the time of the 2000 Census.

The 2000 Census shows that Armstrong County has a total area<3> of 664 square miles [1,720 km²]. Of this total, 653 square miles [1,693 km²] of the area is land, with the balance (1.58%) being water (10.51 square miles [27.23 km²]).

Using the above population and land area values, Armstrong County had a population density of 110.7 people per square mile [42.74 people/km²], making it the state's 39th 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 Armstrong County is available. The QuickFact also contains a comparison between Armstrong and the state of Pennsylvania.

Click here for the Armstrong County QuickFact (QF-42005).

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

(2009 Est)
(2000 Census)
Change in

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

(2009 Est.)
(2000 Census)
Change in
AlleghenyQF-42003   SW1,218,4941,281,666-4.93%
ButlerQF-42019   W184,694174,0836.1%
ClarionQF-42031   N39,47941,765-5.47%
IndianaQF-42063   SE87,45089,605-2.4%
JeffersonQF-42065   NE44,63445,932-2.83%
WestmorelandQF-42129   S362,251369,993-2.09%

Other Roadside Stops ...

About Pennsylvania

Index of Cities, Towns and Villages for Pennsylvania

Off-the-Road Links ...

U.S. Census Bureau
Census QuickFact for Armstrong 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.

- Return to Citation

<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).

- Return to Citation

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

- Return to Citation

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

- Return to Citation