Washington County Demographics

A map of Washington County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	188,331	186,900	89.7%	89.3%
Multiracial	7,387	8,656	3.5%	4.1%
Black	6,628	6,861	3.2%	3.3%
Hispanic	4,335	4,021	2.1%	1.9%
Asian	2,703	1,998	1.3%	1.0%
Native American/Other	658	913	0.3%	0.4%

Washington County, Pennsylvania has an estimated population of 210,042, a less than 1% change from the 209,349 recorded in the 2020 Census. The population is 89.7% White, 3.5% Multiracial, 3.2% Black, 2.1% Hispanic, 1.3% Asian, and 0.3% Native American/Other. This demographic dot map shows the population of Washington County, with one dot drawn for each person counted by the Census, color-coded by race.

Washington has become slightly less racially diverse since 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 Washington County, that probability was 20.0% in 2020 and 19.3% in the most recent ACS estimates.

Washington County is ranked the 18th most populous county in Pennsylvania, out of 67 counties. Washington County was ranked the 18th most populous county in the 2020 Census.

Washington County's White Population

188,331 residents of Washington County, or 89.7% of the population, identify as White. The share of White residents in Washington County is significantly higher than in Pennsylvania overall, where 73% of the population is White. Washington County ranks 34th statewide in terms of White residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's White population has remained roughly the same. White residents' share of Washington County's population has remained roughly unchanged at 89.7%.

Washington County is more White than neighboring Allegheny County (75.5% White). Washington County is less White than neighboring Greene County (91.1% White), Brooke County (92.4% White), Ohio County (89.8% White), and Hancock County (92% White).

Washington County's Black Population

6,628 residents of Washington County, or 3.2% of the population, identify as Black. The share of Black residents in Washington County is lower than in Pennsylvania overall, where 10.3% of the population is Black. Washington County ranks 29th statewide in terms of Black residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's Black population has declined by an estimated 3.4%. Black residents' share of Washington County's population has remained roughly unchanged at 3.2%.

Washington County is more Black than neighboring Greene County (2.7% Black), Brooke County (1.5% Black), and Hancock County (1.8% Black). Washington County is less Black than neighboring Ohio County (3.3% Black), and Allegheny County (12.4% Black).

Washington County's Asian Population

2,703 residents of Washington County, or 1.3% of the population, identify as Asian. The share of Asian residents in Washington County is slightly lower than in Pennsylvania overall, where 3.8% of the population is Asian. Washington County ranks 26th statewide in terms of Asian residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's Asian population has grown by an estimated 35.3%. Asian residents' share of Washington County's population has remained roughly unchanged at 1.3%.

Washington County is more Asian than neighboring Greene County (0.2% Asian), Brooke County (0.7% Asian), Ohio County (0.5% Asian), and Hancock County (0.5% Asian). Washington County is less Asian than neighboring Allegheny County (4.3% Asian).

Washington County's Hispanic Population

4,335 residents of Washington County, or 2.1% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is lower than in Pennsylvania overall, where 8.7% of the population is Hispanic. Washington County ranks 42nd statewide in terms of Hispanic residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's Hispanic population has grown by an estimated 7.8%. Hispanic residents' share of Washington County's population has remained roughly unchanged at 2.1%.

Washington County is more Hispanic than neighboring Greene County (1.6% Hispanic), Brooke County (1.4% Hispanic), Ohio County (1.7% Hispanic), and Hancock County (1.7% Hispanic). Washington County is less Hispanic than neighboring Allegheny County (3% Hispanic).

Washington County's Native American/Other Population

658 residents of Washington County, or 0.3% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Washington County is comparable to the share in Pennsylvania overall, where 0.6% of the population is Native American/Other. Washington County ranks 33rd statewide in terms of Native American/Other residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's Native American/Other population has declined by an estimated 27.9%. Native American/Other residents' share of Washington County's population has remained roughly unchanged at 0.3%.

Washington County is more Native American/Other than neighboring Brooke County (0.1% Native American/Other), and Ohio County (0.2% Native American/Other). Washington County is less Native American/Other than neighboring Allegheny County (0.6% Native American/Other), and Hancock County (0.5% Native American/Other).

Washington County's Multiracial Population

7,387 residents of Washington County, or 3.5% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Pennsylvania overall, where 3.6% of the population is Multiracial. Washington County ranks 7th statewide in terms of Multiracial residents as a share of the population, out of 67 counties.

Since the 2020 Census, Washington County's Multiracial population has declined by an estimated 14.7%. Multiracial residents' share of Washington County's population has decreased from 4.1% to 3.5%.

Washington County is less Multiracial than neighboring Greene County (4.1% Multiracial), Brooke County (4% Multiracial), Ohio County (4.5% 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.