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Summary for Irwin

About Irwin (Click for our profile page)

Located in: Westmoreland County (see below)

Time Zone: Irwin lies in the Eastern Time Zone (EST/EDT)

Telephone Area Codes: 412, 724 & 878<1>

ZIP Code: 15642<2>

Elevation: 1,060 feet [323.09 m] above sea level<3>

From the 2010 US Census (For more detail, see our Census Page for Irwin)

Population

Year	Population
2019 Est:<4>	3,749 (5.64% decrease since 2010)
2010:	3,973 (9% decrease since 2000)
2000:	4,366

Total Area:<5> 0.84 sq. miles [2.2 km²]

Housing Units:<6> 2,222

GPS Coordinates (Latitude/Longitude)<7>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Irwin:

Lat: 40.327800° (or 40°19'40" N)

Lon: -79.703100° (or -79°42'11" W)

USGS Topo Map: Irwin<8>

Federal GNIS/FIPS Codes for Irwin

GNIS ID: 1215703

FIPS State / Place Code: 42 / 37208

(For more about Federal Codes, see our Misc Page for Irwin)

About Westmoreland County

The community of Greensburg is the County Seat for {Westmoreland County}.

From the 2010 US Census (For more detail, see our Census Page for Westmoreland)

Population

Year	Population
2019 Est:	348,899 (4.42% decrease since 2010)
2010	365,028 (1.34% decrease since 2000)
2000:	369,993

Total Area: 1,036 sq. miles [2,683.4 km²]

Housing Units: 168,199

Official Website: https://www.westmorelandcountypa.gov/

Federal GNIS/FIPS Codes for Westmoreland

GNIS ID: 1209191

FIPS State / County Code: 42 / 129

(For more about Federal Codes, see our Misc Page for Irwin)

About Pennsylvania

From the US Census

Population

Year	Population
2019 Est:	12,798,883 (0.76% increase since 2010)
2010:	12,702,379 (3.43% increase since 2000)
2000:	12,281,054

Websites for Commonwealth of Pennsylvania

Official Website: https://www.pa.gov/

Tourism: https://visitpa.com/

Parks: https://www.pa.gov/agencies/dcnr

Fishing: https://www.pa.gov/agencies/fishandboat

Hunting: https://www.pa.gov/agencies/pgc

Federal GNIS/FIPS Codes for Commonwealth of Pennsylvania

GNIS ID: 1779798

FIPS State: 42

(For more about Federal Codes, see our Misc Page for Irwin)

Footnotes ...

<1>	When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 412 code has been Overlayed with one of the following codes: 724 or 878. New phone numbers in the Irwin area will be assigned with one of these codes: 412, 724 or 878. As a result, placing a call in the Irwin area will require 10-digit dialing (where you enter both the area code and then the phone number).
<2>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a community (such as Irwin). When looking for a ZIP Code, whether Irwin or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<3>	The elevation is an estimate for the area around Irwin - it will be higher in some places and lower in others.
<4>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<5>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Irwin. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<6>	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).
<7>	Longitude & latitude values may not be the geographic center of Irwin, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<8>	Name of the USGS 7.5 Minute topographic map which includes Irwin.