Washington County Demographics

A map of Washington County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	124,357	123,855	90.2%	90.6%
Hispanic	5,174	4,827	3.8%	3.5%
Multiracial	3,956	3,757	2.9%	2.7%
Asian	1,997	1,943	1.4%	1.4%
Black	1,790	1,672	1.3%	1.2%
Native American/Other	605	707	0.4%	0.5%

Washington County, Wisconsin has an estimated population of 137,879, a less than 1% change from the 136,761 recorded in the 2020 Census. The population is 90.2% White, 3.8% Hispanic, 2.9% Multiracial, 1.4% Asian, 1.3% Black, and 0.4% 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 more racially diverse since the 2020 Census. It is considerably less diverse than Wisconsin 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 17.8% in 2020 and 18.4% in the most recent ACS estimates.

Washington County is ranked the 11th most populous county in Wisconsin, out of 72 counties. Washington County was ranked the 11th most populous county in the 2020 Census.

Washington County's White Population

124,357 residents of Washington County, or 90.2% of the population, identify as White. The share of White residents in Washington County is considerably higher than in Wisconsin overall, where 78.6% of the population is White. Washington County ranks 32nd statewide in terms of White residents as a share of the population, out of 72 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 90.2%.

Washington County is more White than neighboring Waukesha County (85% White), Fond du Lac County (86% White), Dodge County (87.3% White), Ozaukee County (89.2% White), and Jefferson County (87% White).

Washington County's Black Population

1,790 residents of Washington County, or 1.3% of the population, identify as Black. The share of Black residents in Washington County is slightly lower than in Wisconsin overall, where 5.9% of the population is Black. Washington County ranks 28th statewide in terms of Black residents as a share of the population, out of 72 counties.

Since the 2020 Census, Washington County's Black population has grown by an estimated 7.1%. Black residents' share of Washington County's population has remained roughly unchanged at 1.3%.

Washington County is more Black than neighboring Jefferson County (0.9% Black). Washington County is less Black than neighboring Waukesha County (1.5% Black), Fond du Lac County (1.7% Black), Dodge County (2.5% Black), and Ozaukee County (1.5% Black).

Washington County's Asian Population

1,997 residents of Washington County, or 1.4% of the population, identify as Asian. The share of Asian residents in Washington County is comparable to the share in Wisconsin overall, where 2.9% of the population is Asian. Washington County ranks 19th statewide in terms of Asian residents as a share of the population, out of 72 counties.

Since the 2020 Census, Washington County's Asian population has grown by an estimated 2.8%. Asian residents' share of Washington County's population has remained roughly unchanged at 1.4%.

Washington County is more Asian than neighboring Dodge County (0.5% Asian), and Jefferson County (0.6% Asian). Washington County is less Asian than neighboring Waukesha County (3.9% Asian), Fond du Lac County (1.8% Asian), and Ozaukee County (2.2% Asian).

Washington County's Hispanic Population

5,174 residents of Washington County, or 3.8% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is slightly lower than in Wisconsin overall, where 8% of the population is Hispanic. Washington County ranks 31st statewide in terms of Hispanic residents as a share of the population, out of 72 counties.

Since the 2020 Census, Washington County's Hispanic population has grown by an estimated 7.2%. Hispanic residents' share of Washington County's population has remained roughly unchanged at 3.8%.

Washington County is more Hispanic than neighboring Ozaukee County (3.7% Hispanic). Washington County is less Hispanic than neighboring Waukesha County (5.7% Hispanic), Fond du Lac County (6.8% Hispanic), Dodge County (6.7% Hispanic), and Jefferson County (8.5% Hispanic).

Washington County's Native American/Other Population

605 residents of Washington County, or 0.4% 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 Wisconsin overall, where 0.9% of the population is Native American/Other. Washington County ranks 56th statewide in terms of Native American/Other residents as a share of the population, out of 72 counties.

Since the 2020 Census, Washington County's Native American/Other population has declined by an estimated 14.4%. Native American/Other residents' share of Washington County's population has remained roughly unchanged at 0.4%.

Washington County is more Native American/Other than neighboring Jefferson County (0.3% Native American/Other). Washington County is less Native American/Other than neighboring Waukesha County (0.6% Native American/Other), Fond du Lac County (0.7% Native American/Other), and Dodge County (0.5% Native American/Other).

Washington County's Multiracial Population

3,956 residents of Washington County, or 2.9% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Wisconsin overall, where 3.7% of the population is Multiracial. Washington County ranks 53rd statewide in terms of Multiracial residents as a share of the population, out of 72 counties.

Since the 2020 Census, Washington County's Multiracial population has grown by an estimated 5.3%. Multiracial residents' share of Washington County's population has remained roughly unchanged at 2.9%.

Washington County is more Multiracial than neighboring Dodge County (2.5% Multiracial), and Jefferson County (2.7% Multiracial). Washington County is less Multiracial than neighboring Waukesha County (3.2% Multiracial), Fond du Lac County (3% Multiracial), and Ozaukee County (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.