Washington County Demographics

A map of Washington County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	4,974	5,084	89.9%	91.9%
Hispanic	269	275	4.9%	5.0%
Multiracial	184	144	3.3%	2.6%
Native American/Other	76	10	1.4%	0.2%
Asian	22	4	0.4%	0.1%
Black	8	13	0.1%	0.2%

Washington County, Kansas has an estimated population of 5,533, a less than 1% change from the 5,530 recorded in the 2020 Census. The population is 89.9% White, 4.9% Hispanic, 3.3% Multiracial, 1.4% Native American/Other, 0.4% Asian, and 0.1% Black. 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 more racially diverse since the 2020 Census. It is considerably less diverse than Kansas 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 15.2% in 2020 and 18.8% in the most recent ACS estimates.

Washington County is ranked the 62nd most populous county in Kansas, out of 105 counties. Washington County was ranked the 62nd most populous county in the 2020 Census.

Washington County's White Population

4,974 residents of Washington County, or 89.9% of the population, identify as White. The share of White residents in Washington County is significantly higher than in Kansas overall, where 72.7% of the population is White. Washington County ranks 17th statewide in terms of White residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's White population has declined by an estimated 2.2%. White residents' share of Washington County's population has decreased from 91.9% to 89.9%.

Washington County is more White than neighboring Riley County (73.6% White). Washington County is less White than neighboring Jefferson County (90.5% White), Clay County (90% White), Marshall County (93.3% White), and Republic County (93.3% White).

Washington County's Black Population

8 residents of Washington County, or 0.1% of the population, identify as Black. The share of Black residents in Washington County is lower than in Kansas overall, where 5.2% of the population is Black. Washington County ranks 86th statewide in terms of Black residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's Black population has declined by an estimated 38.5%. Black residents' share of Washington County's population has remained roughly unchanged at 0.1%.

Washington County is less Black than neighboring Jefferson County (0.3% Black), Clay County (2.4% Black), Marshall County (0.7% Black), Republic County (0.5% Black), and Riley County (6.4% Black).

Washington County's Asian Population

22 residents of Washington County, or 0.4% of the population, identify as Asian. The share of Asian residents in Washington County is slightly lower than in Kansas overall, where 2.9% of the population is Asian. Washington County ranks 98th statewide in terms of Asian residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's Asian population has grown by an estimated 450.0%. Asian residents' share of Washington County's population has remained roughly unchanged at 0.4%.

Washington County is more Asian than neighboring Jefferson County (0% Asian), Marshall County (0.3% Asian), and Republic County (0% Asian). Washington County is less Asian than neighboring Clay County (0.6% Asian), and Riley County (4.1% Asian).

Washington County's Hispanic Population

269 residents of Washington County, or 4.9% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is lower than in Kansas overall, where 13.6% of the population is Hispanic. Washington County ranks 59th statewide in terms of Hispanic residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's Hispanic population has declined by an estimated 2.2%. Hispanic residents' share of Washington County's population has remained roughly unchanged at 4.9%.

Washington County is more Hispanic than neighboring Clay County (3.5% Hispanic), Marshall County (2.8% Hispanic), and Republic County (3.9% Hispanic). Washington County is less Hispanic than neighboring Jefferson County (5.9% Hispanic), and Riley County (10% Hispanic).

Washington County's Native American/Other Population

76 residents of Washington County, or 1.4% 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 Kansas overall, where 0.9% of the population is Native American/Other. Washington County ranks 104th statewide in terms of Native American/Other residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's Native American/Other population has grown by an estimated 660.0%. Native American/Other residents' share of Washington County's population has increased from 0.2% to 1.4%.

Washington County is more Native American/Other than neighboring Jefferson County (0.3% Native American/Other), Clay County (0.5% Native American/Other), Marshall County (0.5% Native American/Other), Republic County (0.8% Native American/Other), and Riley County (1% Native American/Other).

Washington County's Multiracial Population

184 residents of Washington County, or 3.3% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Kansas overall, where 4.8% of the population is Multiracial. Washington County ranks 93rd statewide in terms of Multiracial residents as a share of the population, out of 105 counties.

Since the 2020 Census, Washington County's Multiracial population has grown by an estimated 27.8%. Multiracial residents' share of Washington County's population has increased from 2.6% to 3.3%.

Washington County is more Multiracial than neighboring Jefferson County (3.1% Multiracial), Clay County (3% Multiracial), Marshall County (2.4% Multiracial), and Republic County (1.6% Multiracial). Washington County is less Multiracial than neighboring Riley County (4.9% 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.