Westmoreland County Demographics

A map of Westmoreland County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	322,149	323,114	91.4%	91.1%
Multiracial	11,661	12,749	3.3%	3.6%
Black	8,790	8,985	2.5%	2.5%
Hispanic	5,692	5,230	1.6%	1.5%
Asian	3,387	3,301	1.0%	0.9%
Native American/Other	821	1,284	0.2%	0.4%

Westmoreland County, Pennsylvania has an estimated population of 352,500, a less than 1% change from the 354,663 recorded in the 2020 Census. The population is 91.4% White, 3.3% Multiracial, 2.5% Black, 1.6% Hispanic, 1.0% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Westmoreland County, with one dot drawn for each person counted by the Census, color-coded by race.

Westmoreland is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Pennsylvania overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Westmoreland County, that probability was 16.8% in 2020 and 16.3% in the most recent ACS estimates.

Westmoreland County is ranked the 11th most populous county in Pennsylvania, out of 67 counties. Westmoreland County was ranked the 11th most populous county in the 2020 Census.

Westmoreland County's White Population

322,149 residents of Westmoreland County, or 91.4% of the population, identify as White. The share of White residents in Westmoreland County is significantly higher than in Pennsylvania overall, where 73% of the population is White. Westmoreland County ranks 27th statewide in terms of White residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's White population has remained roughly the same. White residents' share of Westmoreland County's population has remained roughly unchanged at 91.4%.

Westmoreland County is more White than neighboring Fayette County (89.1% White), and Allegheny County (75.5% White). Westmoreland County is less White than neighboring Armstrong County (94.9% White), Indiana County (91.7% White), and Somerset County (93.3% White).

Westmoreland County's Black Population

8,790 residents of Westmoreland County, or 2.5% of the population, identify as Black. The share of Black residents in Westmoreland County is lower than in Pennsylvania overall, where 10.3% of the population is Black. Westmoreland County ranks 36th statewide in terms of Black residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's Black population has declined by an estimated 2.2%. Black residents' share of Westmoreland County's population has remained roughly unchanged at 2.5%.

Westmoreland County is more Black than neighboring Armstrong County (0.9% Black), and Indiana County (2.1% Black). Westmoreland County is less Black than neighboring Fayette County (3.9% Black), Allegheny County (12.4% Black), and Somerset County (2.6% Black).

Westmoreland County's Asian Population

3,387 residents of Westmoreland County, or 1.0% of the population, identify as Asian. The share of Asian residents in Westmoreland County is slightly lower than in Pennsylvania overall, where 3.8% of the population is Asian. Westmoreland County ranks 27th statewide in terms of Asian residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's Asian population has grown by an estimated 2.6%. Asian residents' share of Westmoreland County's population has remained roughly unchanged at 1.0%.

Westmoreland County is more Asian than neighboring Fayette County (0.5% Asian), Armstrong County (0.3% Asian), Indiana County (0.9% Asian), and Somerset County (0.5% Asian). Westmoreland County is less Asian than neighboring Allegheny County (4.3% Asian).

Westmoreland County's Hispanic Population

5,692 residents of Westmoreland County, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in Westmoreland County is lower than in Pennsylvania overall, where 8.7% of the population is Hispanic. Westmoreland County ranks 53rd statewide in terms of Hispanic residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's Hispanic population has grown by an estimated 8.8%. Hispanic residents' share of Westmoreland County's population has remained roughly unchanged at 1.6%.

Westmoreland County is more Hispanic than neighboring Fayette County (1.4% Hispanic), Armstrong County (0.9% Hispanic), and Somerset County (1.5% Hispanic). Westmoreland County is less Hispanic than neighboring Indiana County (1.9% Hispanic), and Allegheny County (3% Hispanic).

Westmoreland County's Native American/Other Population

821 residents of Westmoreland County, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Westmoreland County is comparable to the share in Pennsylvania overall, where 0.6% of the population is Native American/Other. Westmoreland County ranks 47th statewide in terms of Native American/Other residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's Native American/Other population has declined by an estimated 36.1%. Native American/Other residents' share of Westmoreland County's population has remained roughly unchanged at 0.2%.

Westmoreland County is more Native American/Other than neighboring Indiana County (0.1% Native American/Other). Westmoreland County is less Native American/Other than neighboring Fayette County (0.4% Native American/Other), Allegheny County (0.6% Native American/Other), and Somerset County (0.4% Native American/Other).

Westmoreland County's Multiracial Population

11,661 residents of Westmoreland County, or 3.3% of the population, identify as Multiracial. The share of Multiracial residents in Westmoreland County is comparable to the share in Pennsylvania overall, where 3.6% of the population is Multiracial. Westmoreland County ranks 21st statewide in terms of Multiracial residents as a share of the population, out of 67 counties.

Since the 2020 Census, Westmoreland County's Multiracial population has declined by an estimated 8.5%. Multiracial residents' share of Westmoreland County's population has remained roughly unchanged at 3.3%.

Westmoreland County is more Multiracial than neighboring Armstrong County (2.7% Multiracial), and Somerset County (1.6% Multiracial). Westmoreland County is less Multiracial than neighboring Fayette County (4.8% Multiracial), and Allegheny County (4.3% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.