Blaine County Demographics

A map of Blaine County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	17,943	18,024	71.9%	74.3%
Hispanic	5,451	5,021	21.8%	20.7%
Multiracial	1,193	806	4.8%	3.3%
Asian	147	211	0.6%	0.9%
Native American/Other	134	165	0.5%	0.7%
Black	83	45	0.3%	0.2%

Blaine County, Idaho has an estimated population of 24,951, a slight increase from the 24,272 recorded in the 2020 Census. The population is 71.9% White, 21.8% Hispanic, 4.8% Multiracial, 0.6% Asian, 0.5% Native American/Other, and 0.3% Black. This demographic dot map shows the population of Blaine County, with one dot drawn for each person counted by the Census, color-coded by race.

Blaine has become more racially diverse since the 2020 Census. It is considerably 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 Blaine County, that probability was 40.5% in 2020 and 43.3% in the most recent ACS estimates.

Blaine County is ranked the 17th most populous county in Idaho, out of 44 counties. Blaine County was ranked the 16th most populous county in the 2020 Census.

Blaine County's White Population

17,943 residents of Blaine County, or 71.9% of the population, identify as White. The share of White residents in Blaine County is lower than in Idaho overall, where 78.6% of the population is White. Blaine County ranks 33rd statewide in terms of White residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's White population has remained roughly the same. White residents' share of Blaine County's population has decreased from 74.3% to 71.9%.

Blaine County is more White than neighboring Lincoln County (62.2% White), Minidoka County (58.8% White), and Jerome County (56.8% White). Blaine County is less White than neighboring Camas County (75.9% White), and Butte County (88.7% White).

Blaine County's Black Population

83 residents of Blaine County, or 0.3% of the population, identify as Black. The share of Black residents in Blaine County is comparable to the share in Idaho overall, where 0.7% of the population is Black. Blaine County ranks 25th statewide in terms of Black residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's Black population has grown by an estimated 84.4%. Black residents' share of Blaine County's population has remained roughly unchanged at 0.3%.

Blaine County is more Black than neighboring Minidoka County (0.1% Black), Jerome County (0.1% Black), Camas County (0% Black), and Butte County (0% Black). Blaine County is less Black than neighboring Lincoln County (0.6% Black).

Blaine County's Asian Population

147 residents of Blaine County, or 0.6% of the population, identify as Asian. The share of Asian residents in Blaine County is comparable to the share in Idaho overall, where 1.3% of the population is Asian. Blaine County ranks 8th statewide in terms of Asian residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's Asian population has declined by an estimated 30.3%. Asian residents' share of Blaine County's population has remained roughly unchanged at 0.6%.

Blaine County is more Asian than neighboring Lincoln County (0.3% Asian), Minidoka County (0.2% Asian), Jerome County (0% Asian), Camas County (0% Asian), and Butte County (0% Asian).

Blaine County's Hispanic Population

5,451 residents of Blaine County, or 21.8% of the population, identify as Hispanic. The share of Hispanic residents in Blaine County is higher than in Idaho overall, where 13.6% of the population is Hispanic. Blaine County ranks 10th statewide in terms of Hispanic residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's Hispanic population has grown by an estimated 8.6%. Hispanic residents' share of Blaine County's population has increased from 20.7% to 21.8%.

Blaine County is more Hispanic than neighboring Camas County (14% Hispanic), and Butte County (6.4% Hispanic). Blaine County is less Hispanic than neighboring Lincoln County (32.4% Hispanic), Minidoka County (37% Hispanic), and Jerome County (39.2% Hispanic).

Blaine County's Native American/Other Population

134 residents of Blaine County, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Blaine County is comparable to the share in Idaho overall, where 1.5% of the population is Native American/Other. Blaine County ranks 38th statewide in terms of Native American/Other residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's Native American/Other population has declined by an estimated 18.8%. Native American/Other residents' share of Blaine County's population has remained roughly unchanged at 0.5%.

Blaine County is more Native American/Other than neighboring Jerome County (0.2% Native American/Other), and Butte County (0.3% Native American/Other). Blaine County is less Native American/Other than neighboring Lincoln County (0.6% Native American/Other), Minidoka County (1.5% Native American/Other), and Camas County (4.4% Native American/Other).

Blaine County's Multiracial Population

1,193 residents of Blaine County, or 4.8% of the population, identify as Multiracial. The share of Multiracial residents in Blaine County is comparable to the share in Idaho overall, where 4.2% of the population is Multiracial. Blaine County ranks 28th statewide in terms of Multiracial residents as a share of the population, out of 44 counties.

Since the 2020 Census, Blaine County's Multiracial population has grown by an estimated 48.0%. Multiracial residents' share of Blaine County's population has increased from 3.3% to 4.8%.

Blaine County is more Multiracial than neighboring Lincoln County (3.9% Multiracial), Minidoka County (2.3% Multiracial), Jerome County (3.6% Multiracial), and Butte County (4.5% Multiracial). Blaine County is less Multiracial than neighboring Camas County (5.7% 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.