Adams County Demographics

A map of Adams County's Population by Race

Adams County, Washington has an estimated population of 20,800, a less than 1% change from the 20,613 recorded in the 2020 Census. The population is 64.5% Hispanic, 31.1% White, 2.6% Multiracial, 1.0% Native American/Other, 0.6% Asian, and 0.2% Black. This demographic dot map shows the population of Adams County, with one dot drawn for each person counted by the Census, color-coded by race.

Adams is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Washington overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Adams County, that probability was 48.5% in 2020 and 48.6% in the most recent ACS estimates.

Adams County is ranked the 31st most populous county in Washington, out of 39 counties. Adams County was ranked the 31st most populous county in the 2020 Census.

Adams County's White Population

6,469 residents of Adams County, or 31.1% of the population, identify as White. The share of White residents in Adams County is significantly lower than in Washington overall, where 63.1% of the population is White. Adams County ranks 39th statewide in terms of White residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's White population has declined by an estimated 5.3%. White residents' share of Adams County's population has decreased from 33.1% to 31.1%.

Adams County is less White than neighboring Franklin County (37.1% White), Lincoln County (88.7% White), Walla Walla County (67.7% White), Grant County (49.2% White), and Columbia County (81.2% White).

Adams County's Black Population

40 residents of Adams County, or 0.2% of the population, identify as Black. The share of Black residents in Adams County is slightly lower than in Washington overall, where 3.8% of the population is Black. Adams County ranks 39th statewide in terms of Black residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's Black population has grown by an estimated 66.7%. Black residents' share of Adams County's population has remained roughly unchanged at 0.2%.

Adams County is less Black than neighboring Franklin County (1.9% Black), Lincoln County (0.5% Black), Walla Walla County (1.6% Black), Grant County (1.2% Black), and Columbia County (0.5% Black).

Adams County's Asian Population

119 residents of Adams County, or 0.6% of the population, identify as Asian. The share of Asian residents in Adams County is lower than in Washington overall, where 9.7% of the population is Asian. Adams County ranks 32nd statewide in terms of Asian residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's Asian population has declined by an estimated 7.8%. Asian residents' share of Adams County's population has remained roughly unchanged at 0.6%.

Adams County is more Asian than neighboring Lincoln County (0.5% Asian). Adams County is less Asian than neighboring Franklin County (1.7% Asian), Walla Walla County (1.8% Asian), Grant County (0.8% Asian), and Columbia County (1.9% Asian).

Adams County's Hispanic Population

13,423 residents of Adams County, or 64.5% of the population, identify as Hispanic. The share of Hispanic residents in Adams County is significantly higher than in Washington overall, where 14.4% of the population is Hispanic. Adams County ranks 1st statewide in terms of Hispanic residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's Hispanic population has grown by an estimated 2.3%. Hispanic residents' share of Adams County's population has increased from 63.6% to 64.5%.

Adams County is more Hispanic than neighboring Franklin County (55.3% Hispanic), Lincoln County (4.2% Hispanic), Walla Walla County (23.8% Hispanic), Grant County (43.9% Hispanic), and Columbia County (8.3% Hispanic).

Adams County's Native American/Other Population

214 residents of Adams County, or 1.0% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Adams County is comparable to the share in Washington overall, where 2.1% of the population is Native American/Other. Adams County ranks 39th statewide in terms of Native American/Other residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's Native American/Other population has grown by an estimated 39.9%. Native American/Other residents' share of Adams County's population has remained roughly unchanged at 1.0%.

Adams County is more Native American/Other than neighboring Franklin County (0.9% Native American/Other), Grant County (0.8% Native American/Other), and Columbia County (0.5% Native American/Other). Adams County is less Native American/Other than neighboring Lincoln County (2% Native American/Other).

Adams County's Multiracial Population

535 residents of Adams County, or 2.6% of the population, identify as Multiracial. The share of Multiracial residents in Adams County is slightly lower than in Washington overall, where 6.8% of the population is Multiracial. Adams County ranks 39th statewide in terms of Multiracial residents as a share of the population, out of 39 counties.

Since the 2020 Census, Adams County's Multiracial population has grown by an estimated 49.4%. Multiracial residents' share of Adams County's population has increased from 1.7% to 2.6%.

Adams County is less Multiracial than neighboring Franklin County (3.1% Multiracial), Lincoln County (4.2% Multiracial), Walla Walla County (4.1% Multiracial), Grant County (4.1% Multiracial), and Columbia County (7.5% 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.