Washington County Demographics

A map of Washington County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	8,648	8,118	77.6%	77.3%
Hispanic	1,843	1,662	16.5%	15.8%
Multiracial	475	488	4.3%	4.6%
Asian	72	81	0.6%	0.8%
Native American/Other	71	134	0.6%	1.3%
Black	33	17	0.3%	0.2%

Washington County, Idaho has an estimated population of 11,142, an increase from the 10,500 recorded in the 2020 Census. The population is 77.6% White, 16.5% Hispanic, 4.3% Multiracial, 0.6% Asian, 0.6% Native American/Other, and 0.3% 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 slightly less racially diverse since the 2020 Census. It is slightly more diverse than Idaho 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 37.5% in 2020 and 36.8% in the most recent ACS estimates.

Washington County is ranked the 29th most populous county in Idaho, out of 44 counties. Washington County was ranked the 29th most populous county in the 2020 Census.

Washington County's White Population

8,648 residents of Washington County, or 77.6% of the population, identify as White. The share of White residents in Washington County is comparable to the share in Idaho overall, where 78.6% of the population is White. Washington County ranks 30th statewide in terms of White residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's White population has grown by an estimated 6.5%. White residents' share of Washington County's population has remained roughly unchanged at 77.6%.

Washington County is more White than neighboring Payette County (75.5% White), and Canyon County (67.1% White). Washington County is less White than neighboring Adams County (87% White), Gem County (83.5% White), and Baker County (87.8% White).

Washington County's Black Population

33 residents of Washington County, or 0.3% of the population, identify as Black. The share of Black residents in Washington County is comparable to the share in Idaho overall, where 0.7% of the population is Black. Washington County ranks 27th statewide in terms of Black residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's Black population has grown by an estimated 94.1%. Black residents' share of Washington County's population has remained roughly unchanged at 0.3%.

Washington County is more Black than neighboring Payette County (0.1% Black), Adams County (0.2% Black), and Gem County (0% Black). Washington County is less Black than neighboring Canyon County (0.7% Black), and Baker County (1.3% Black).

Washington County's Asian Population

72 residents of Washington County, or 0.6% of the population, identify as Asian. The share of Asian residents in Washington County is comparable to the share in Idaho overall, where 1.3% of the population is Asian. Washington County ranks 12th statewide in terms of Asian residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's Asian population has declined by an estimated 11.1%. Asian residents' share of Washington County's population has remained roughly unchanged at 0.6%.

Washington County is more Asian than neighboring Adams County (0% Asian), and Baker County (0.4% Asian). Washington County is less Asian than neighboring Payette County (0.7% Asian), Gem County (0.8% Asian), and Canyon County (0.8% Asian).

Washington County's Hispanic Population

1,843 residents of Washington County, or 16.5% of the population, identify as Hispanic. The share of Hispanic residents in Washington County is slightly higher than in Idaho overall, where 13.6% of the population is Hispanic. Washington County ranks 16th statewide in terms of Hispanic residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's Hispanic population has grown by an estimated 10.9%. Hispanic residents' share of Washington County's population has increased from 15.8% to 16.5%.

Washington County is more Hispanic than neighboring Adams County (5% Hispanic), Gem County (9.7% Hispanic), and Baker County (5.3% Hispanic). Washington County is less Hispanic than neighboring Payette County (17.9% Hispanic), and Canyon County (26% Hispanic).

Washington County's Native American/Other Population

71 residents of Washington County, or 0.6% 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 Idaho overall, where 1.5% of the population is Native American/Other. Washington County ranks 18th statewide in terms of Native American/Other residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's Native American/Other population has declined by an estimated 47.0%. Native American/Other residents' share of Washington County's population has decreased from 1.3% to 0.6%.

Washington County is less Native American/Other than neighboring Payette County (1.6% Native American/Other), Adams County (2.1% Native American/Other), Gem County (1.5% Native American/Other), Canyon County (1.4% Native American/Other), and Baker County (1.3% Native American/Other).

Washington County's Multiracial Population

475 residents of Washington County, or 4.3% of the population, identify as Multiracial. The share of Multiracial residents in Washington County is comparable to the share in Idaho overall, where 4.2% of the population is Multiracial. Washington County ranks 12th statewide in terms of Multiracial residents as a share of the population, out of 44 counties.

Since the 2020 Census, Washington County's Multiracial population has declined by an estimated 2.7%. Multiracial residents' share of Washington County's population has remained roughly unchanged at 4.3%.

Washington County is more Multiracial than neighboring Payette County (4.2% Multiracial), Canyon County (4% Multiracial), and Baker County (3.9% Multiracial). Washington County is less Multiracial than neighboring Adams County (5.8% Multiracial), and Gem County (4.5% 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.