• county
  • FIPS 42129
  • Largest town: Murrysville

Westmoreland County, Pennsylvania

Westmoreland County had 350,935 residents in the Census Vintage 2024 estimate, on 1,027.7 square miles of land. It ranks 11th of 67 in Pennsylvania by population and 8th by land area.

Population
350,935
#11 of 67 in Pennsylvania · #215 in US
Area
1,027.7 sq mi
#8 of 67 in Pennsylvania · #645 in US
Density
341 / sq mi
#18 of 67 in Pennsylvania · #391 in US
Median household income
$70,985
#23 of 67 in Pennsylvania · #935 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Westmoreland County within Pennsylvania. Pin: Harrisburg.

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Westmoreland County population, land area and income

Westmoreland County had 350,935 residents in the Census Vintage 2024 estimate, on 1,027.7 square miles of land. It ranks 11th of 67 in Pennsylvania by population and 8th by land area. That works out to 341.5 people per square mile, 3.5 times the US average of 96.3, and in the top quarter nationally.

The median county-equivalent in Pennsylvania has 82,953 residents, so Westmoreland County is 4.2 times that size.

Its SAIPE 2023 median household income of $70,985 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

350,935

3144th1st

215th of 3,144 (US)

Land area

1,028 sq mi

3144th1st

645th of 3,144 (US)

Density

341.5 / sq mi

3144th1st

391st of 3,144 (US)

Median household income

$70,985

3143rd1st

935th of 3,143 (US)

Rank within Pennsylvania (67)

Population

350,935

67th1st

11th of 67 (PA)

Land area

1,028 sq mi

67th1st

8th of 67 (PA)

Density

341.5 / sq mi

67th1st

18th of 67 (PA)

Median household income

$70,985

67th1st

23rd of 67 (PA)

How Westmoreland County's population changed since 2020

Westmoreland County lost 3,404 residents between the July 2020 and July 2024 estimates, a drop of 1.0%. That ranks 40th of 67 in Pennsylvania for growth. The median Pennsylvania county changed by -0.5%, and the state as a whole by +0.6%.

Since the April 2020 estimates base, Westmoreland County recorded 12,157 births and 21,134 deaths, a natural change of -8,977. Net international migration added +824 and net domestic migration, people moving to or from other US counties, came to +4,506. The largest single component was natural change, which removed 8,977 people.

354.3k2020353.8k2021352.1k2022351.4k2023350.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
12,157
Deaths
21,134
Net international migration
+824
Net domestic migration
+4,506
Change, July 2023 to July 2024
-485

Where Westmoreland County is

The Census internal point of Westmoreland County is at 40.311100, -79.466700. It sits in UTM zone 17N. The map shades Pennsylvania's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Westmoreland County outlined. Dots are towns of 1,000+ people with residents in it.

Adams County: +4.0%Potter County: -2.4%Sullivan County: +1.6%Bucks County: +0.6%Carbon County: +1.5%McKean County: -2.3%Montour County: -0.1%Fulton County: -0.9%Columbia County: +2.0%Cameron County: -4.1%Elk County: -2.6%Bradford County: -0.4%Bedford County: +0.1%York County: +3.2%Monroe County: -1.1%Forest County: -5.2%Berks County: +2.4%Cambria County: -2.3%Franklin County: +2.1%Snyder County: -0.3%Somerset County: -2.5%Clarion County: -0.9%Indiana County: -0.2%Lackawanna County: +0.6%Wyoming County: -1.0%Lawrence County: -2.0%Mercer County: -2.2%Lehigh County: +3.0%Northampton County: +3.3%Cumberland County: +5.9%Fayette County: -3.6%Jefferson County: -2.5%Centre County: +1.2%Lebanon County: +1.4%Union County: -1.2%Clinton County: +1.3%Chester County: +4.8%Montgomery County: +2.6%Wayne County: +0.5%Pike County: +6.5%Susquehanna County: -0.6%Allegheny County: -1.4%Clearfield County: -2.9%Butler County: +2.7%Beaver County: -1.4%Crawford County: -2.1%Washington County: +0.5%Venango County: -1.7%Warren County: -3.0%Blair County: -2.0%Huntingdon County: -1.6%Lancaster County: +1.9%Luzerne County: +1.9%Westmoreland County: -1.0%Juniata County: -0.4%Armstrong County: -2.7%Tioga County: -0.8%Delaware County: +1.4%Northumberland County: -1.7%Mifflin County: -0.5%Lycoming County: -0.8%Perry County: +2.1%Philadelphia County: -1.7%Schuylkill County: +1.1%Dauphin County: +2.2%Greene County: -5.3%Erie County: -1.1%
Change 2020 to 2024
  1. < -2.2%
  2. < -1.0%
  3. < +0.1%
  4. < +1.9%
  5. ≥ +1.9%
no data

Orange pin: Westmoreland County internal point. Dark pin: Harrisburg.

Internal point

Decimal
40.311100, -79.466700
DMS
40°18'39.96"N 79°28'0.12"W
UTM
17N 630288.7E 4463415.2N
Geohash
dppmrdqj5
Plus code
87G28G6M+C8

Towns in Westmoreland County

24 incorporated places of 1,000+ people have residents in Westmoreland County, 132,296 people together, or 38% of the county. Each figure counts only the part of the town inside Westmoreland County; towns marked "part" extend into another county. The largest is Murrysville with 20,729.

  1. 01Murrysville20,729
  2. 02Greensburg14,586
  3. 03New Kensington11,877
  4. 04Lower Burrell11,542
  5. 05Jeannette8,566
  6. 06Latrobe7,906
  7. 07Monessen6,704
  8. 08Vandergrift4,955
  9. 09Arnold4,657
  10. 10Scottdale4,329
  11. 11Mount Pleasant4,150
  12. 12Irwin3,798
  13. 13Manor3,510
  14. 14Trafford (part)3,147
  15. 15Youngwood2,906
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Westmoreland County

The Census 2024 county adjacency file lists 8 neighbors for Westmoreland County. The most populous is Allegheny County, PA, with 1,231,814 residents. Distances run between Census internal points in a straight line.

Distance to Harrisburg and the nearest big city

Harrisburg is 136.2 miles E of Westmoreland County's internal point in a straight line. The nearest place of 100,000 or more is Pittsburgh, PA (population 307,668), 28.2 miles away. The nearest place of 10,000 or more is Greensburg, PA (population 14,586), 4.1 miles away.

Westmoreland County FIPS code

The FIPS code of Westmoreland County is 42129: state code 42 for Pennsylvania plus county code 129. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $70,985.

Questions people ask

What is the population of Westmoreland County, Pennsylvania?

The Census Vintage 2024 estimate for July 1, 2024 is 350,935. That is down 3,404 people (1.0%) from the July 2020 estimate of 354,339.

What is the FIPS code of Westmoreland County?

42129. The first two digits (42) are Pennsylvania; the last three (129) identify the county.

What is the largest town in Westmoreland County?

Murrysville, with 20,729 residents inside Westmoreland County in 2024.

Which counties border Westmoreland County?

8 county-equivalents border it in the Census 2024 adjacency file: Allegheny County, PA; Washington County, PA; Butler County, PA; Cambria County, PA; Fayette County, PA; Indiana County, PA; Somerset County, PA; Armstrong County, PA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.