Union County Demographics

A map of Union County's Population by Race

Union County, Oregon has an estimated population of 26,144, a less than 1% change from the 26,196 recorded in the 2020 Census. The population is 85.8% White, 5.5% Hispanic, 3.9% Multiracial, 2.8% Native American/Other, 1.1% Asian, and 0.8% Black. This demographic dot map shows the population of Union County, with one dot drawn for each person counted by the Census, color-coded by race.

Union has become less racially diverse since the 2020 Census. It is considerably less diverse than Oregon overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Union County, that probability was 28.2% in 2020 and 25.8% in the most recent ACS estimates.

Union County is ranked the 24th most populous county in Oregon, out of 36 counties. Union County was ranked the 23rd most populous county in the 2020 Census.

Union County's White Population

22,439 residents of Union County, or 85.8% of the population, identify as White. The share of White residents in Union County is considerably higher than in Oregon overall, where 71.4% of the population is White. Union County ranks 9th statewide in terms of White residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's White population has grown by an estimated 1.6%. White residents' share of Union County's population has increased from 84.3% to 85.8%.

Union County is more White than neighboring Umatilla County (61.5% White), Columbia County (81.2% White), and Walla Walla County (67.7% White). Union County is less White than neighboring Baker County (87.8% White), and Wallowa County (89.2% White).

Union County's Black Population

222 residents of Union County, or 0.8% of the population, identify as Black. The share of Black residents in Union County is comparable to the share in Oregon overall, where 1.8% of the population is Black. Union County ranks 15th statewide in terms of Black residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's Black population has grown by an estimated 53.1%. Black residents' share of Union County's population has remained roughly unchanged at 0.8%.

Union County is more Black than neighboring Umatilla County (0.7% Black), and Columbia County (0.5% Black). Union County is less Black than neighboring Baker County (1.3% Black), Wallowa County (1.3% Black), and Walla Walla County (1.6% Black).

Union County's Asian Population

300 residents of Union County, or 1.1% of the population, identify as Asian. The share of Asian residents in Union County is slightly lower than in Oregon overall, where 4.4% of the population is Asian. Union County ranks 25th statewide in terms of Asian residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's Asian population has grown by an estimated 38.9%. Asian residents' share of Union County's population has remained roughly unchanged at 1.1%.

Union County is more Asian than neighboring Baker County (0.4% Asian), Umatilla County (0.7% Asian), and Wallowa County (0.3% Asian). Union County is less Asian than neighboring Columbia County (1.9% Asian), and Walla Walla County (1.8% Asian).

Union County's Hispanic Population

1,441 residents of Union County, or 5.5% of the population, identify as Hispanic. The share of Hispanic residents in Union County is lower than in Oregon overall, where 14.7% of the population is Hispanic. Union County ranks 33rd statewide in terms of Hispanic residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's Hispanic population has grown by an estimated 7.0%. Hispanic residents' share of Union County's population has remained roughly unchanged at 5.5%.

Union County is more Hispanic than neighboring Baker County (5.3% Hispanic), and Wallowa County (4.2% Hispanic). Union County is less Hispanic than neighboring Umatilla County (29.7% Hispanic), Columbia County (8.3% Hispanic), and Walla Walla County (23.8% Hispanic).

Union County's Native American/Other Population

734 residents of Union County, or 2.8% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Union County is comparable to the share in Oregon overall, where 1.6% of the population is Native American/Other. Union County ranks 7th statewide in terms of Native American/Other residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's Native American/Other population has declined by an estimated 12.2%. Native American/Other residents' share of Union County's population has remained roughly unchanged at 2.8%.

Union County is more Native American/Other than neighboring Baker County (1.3% Native American/Other), Umatilla County (2.6% Native American/Other), Wallowa County (1% Native American/Other), Columbia County (0.5% Native American/Other), and Walla Walla County (1% Native American/Other).

Union County's Multiracial Population

1,008 residents of Union County, or 3.9% of the population, identify as Multiracial. The share of Multiracial residents in Union County is slightly lower than in Oregon overall, where 6.1% of the population is Multiracial. Union County ranks 16th statewide in terms of Multiracial residents as a share of the population, out of 36 counties.

Since the 2020 Census, Union County's Multiracial population has declined by an estimated 36.1%. Multiracial residents' share of Union County's population has decreased from 6.0% to 3.9%.

Union County is less Multiracial than neighboring Umatilla County (4.8% Multiracial), Wallowa County (4% Multiracial), Columbia County (7.5% Multiracial), and Walla Walla County (4.1% 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.