Gilliam County Demographics

A map of Gilliam County's Population by Race

Gilliam County, Oregon has an estimated population of 1,971, a slight decrease from the 1,995 recorded in the 2020 Census. The population is 80.0% White, 9.4% Hispanic, 7.9% Multiracial, 2.7% Native American/Other, 0.0% Black, and 0.0% Asian. This demographic dot map shows the population of Gilliam County, with one dot drawn for each person counted by the Census, color-coded by race.

Gilliam has become considerably more 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 Gilliam County, that probability was 22.8% in 2020 and 34.5% in the most recent ACS estimates.

Gilliam County is ranked the 34th most populous county in Oregon, out of 36 counties. Gilliam County was ranked the 34th most populous county in the 2020 Census.

Gilliam County's White Population

1,576 residents of Gilliam County, or 80.0% of the population, identify as White. The share of White residents in Gilliam County is higher than in Oregon overall, where 71.4% of the population is White. Gilliam County ranks 4th statewide in terms of White residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's White population has declined by an estimated 9.8%. White residents' share of Gilliam County's population has decreased from 87.6% to 80.0%.

Gilliam County is more White than neighboring Morrow County (52.5% White), Klickitat County (78.8% White), and Wasco County (70.8% White). Gilliam County is less White than neighboring Sherman County (85.4% White), and Wheeler County (83.3% White).

Gilliam County's Black Population

0 residents of Gilliam County, or 0.0% of the population, identify as Black. The share of Black residents in Gilliam County is comparable to the share in Oregon overall, where 1.8% of the population is Black. Gilliam County ranks 31st statewide in terms of Black residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's Black population has declined by an estimated 100.0%. Black residents' share of Gilliam County's population has remained roughly unchanged at 0.0%.

Gilliam County is less Black than neighboring Sherman County (0.5% Black), Morrow County (0.8% Black), Klickitat County (0.3% Black), and Wasco County (0.4% Black).

Gilliam County's Asian Population

0 residents of Gilliam County, or 0.0% of the population, identify as Asian. The share of Asian residents in Gilliam County is slightly lower than in Oregon overall, where 4.4% of the population is Asian. Gilliam County ranks 35th statewide in terms of Asian residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's Asian population has declined by an estimated 100.0%. Asian residents' share of Gilliam County's population has remained roughly unchanged at 0.0%.

Gilliam County is less Asian than neighboring Sherman County (0.3% Asian), Morrow County (0.2% Asian), Wheeler County (0.5% Asian), Klickitat County (0.8% Asian), and Wasco County (0.7% Asian).

Gilliam County's Hispanic Population

186 residents of Gilliam County, or 9.4% of the population, identify as Hispanic. The share of Hispanic residents in Gilliam County is lower than in Oregon overall, where 14.7% of the population is Hispanic. Gilliam County ranks 31st statewide in terms of Hispanic residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's Hispanic population has grown by an estimated 73.8%. Hispanic residents' share of Gilliam County's population has increased from 5.4% to 9.4%.

Gilliam County is more Hispanic than neighboring Sherman County (4.4% Hispanic), and Wheeler County (4.8% Hispanic). Gilliam County is less Hispanic than neighboring Morrow County (42% Hispanic), Klickitat County (13.2% Hispanic), and Wasco County (20.6% Hispanic).

Gilliam County's Native American/Other Population

54 residents of Gilliam County, or 2.7% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Gilliam County is comparable to the share in Oregon overall, where 1.6% of the population is Native American/Other. Gilliam County ranks 13th statewide in terms of Native American/Other residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's Native American/Other population has grown by an estimated 31.7%. Native American/Other residents' share of Gilliam County's population has increased from 2.1% to 2.7%.

Gilliam County is more Native American/Other than neighboring Sherman County (0.7% Native American/Other), Morrow County (0.4% Native American/Other), Wheeler County (1.2% Native American/Other), Klickitat County (2.2% Native American/Other), and Wasco County (2.3% Native American/Other).

Gilliam County's Multiracial Population

155 residents of Gilliam County, or 7.9% of the population, identify as Multiracial. The share of Multiracial residents in Gilliam County is comparable to the share in Oregon overall, where 6.1% of the population is Multiracial. Gilliam County ranks 33rd statewide in terms of Multiracial residents as a share of the population, out of 36 counties.

Since the 2020 Census, Gilliam County's Multiracial population has grown by an estimated 70.3%. Multiracial residents' share of Gilliam County's population has increased from 4.6% to 7.9%.

Gilliam County is more Multiracial than neighboring Morrow County (4% Multiracial), Klickitat County (4.7% Multiracial), and Wasco County (5.2% Multiracial). Gilliam County is less Multiracial than neighboring Sherman County (8.8% Multiracial), and Wheeler County (10.2% 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.