Cassia County Demographics

A map of Cassia County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	16,401	16,522	64.4%	67.0%
Hispanic	7,664	7,186	30.1%	29.1%
Multiracial	838	521	3.3%	2.1%
Native American/Other	395	231	1.6%	0.9%
Black	118	64	0.5%	0.3%
Asian	67	131	0.3%	0.5%

Cassia County, Idaho has an estimated population of 25,483, an increase from the 24,655 recorded in the 2020 Census. The population is 64.4% White, 30.1% Hispanic, 3.3% Multiracial, 1.6% Native American/Other, 0.5% Black, and 0.3% Asian. This demographic dot map shows the population of Cassia County, with one dot drawn for each person counted by the Census, color-coded by race.

Cassia 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 Cassia County, that probability was 46.5% in 2020 and 49.4% in the most recent ACS estimates.

Cassia County is ranked the 15th most populous county in Idaho, out of 44 counties. Cassia County was ranked the 15th most populous county in the 2020 Census.

Cassia County's White Population

16,401 residents of Cassia County, or 64.4% of the population, identify as White. The share of White residents in Cassia County is considerably lower than in Idaho overall, where 78.6% of the population is White. Cassia County ranks 38th statewide in terms of White residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's White population has remained roughly the same. White residents' share of Cassia County's population has decreased from 67.0% to 64.4%.

Cassia County is more White than neighboring Minidoka County (58.8% White), Jerome County (56.8% White), Power County (60.5% White), and Lincoln County (62.2% White). Cassia County is less White than neighboring Box Elder County (85.4% White).

Cassia County's Black Population

118 residents of Cassia County, or 0.5% of the population, identify as Black. The share of Black residents in Cassia County is comparable to the share in Idaho overall, where 0.7% of the population is Black. Cassia County ranks 14th statewide in terms of Black residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's Black population has grown by an estimated 84.4%. Black residents' share of Cassia County's population has remained roughly unchanged at 0.5%.

Cassia County is more Black than neighboring Minidoka County (0.1% Black), Jerome County (0.1% Black), Power County (0.4% Black), and Box Elder County (0.3% Black). Cassia County is less Black than neighboring Lincoln County (0.6% Black).

Cassia County's Asian Population

67 residents of Cassia County, or 0.3% of the population, identify as Asian. The share of Asian residents in Cassia County is comparable to the share in Idaho overall, where 1.3% of the population is Asian. Cassia County ranks 17th statewide in terms of Asian residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's Asian population has declined by an estimated 48.9%. Asian residents' share of Cassia County's population has remained roughly unchanged at 0.3%.

Cassia County is more Asian than neighboring Minidoka County (0.2% Asian), Jerome County (0% Asian), and Power County (0% Asian). Cassia County is less Asian than neighboring Box Elder County (0.6% Asian).

Cassia County's Hispanic Population

7,664 residents of Cassia County, or 30.1% of the population, identify as Hispanic. The share of Hispanic residents in Cassia County is significantly higher than in Idaho overall, where 13.6% of the population is Hispanic. Cassia County ranks 7th statewide in terms of Hispanic residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's Hispanic population has grown by an estimated 6.7%. Hispanic residents' share of Cassia County's population has increased from 29.1% to 30.1%.

Cassia County is more Hispanic than neighboring Box Elder County (10.2% Hispanic). Cassia County is less Hispanic than neighboring Minidoka County (37% Hispanic), Jerome County (39.2% Hispanic), Power County (34.3% Hispanic), and Lincoln County (32.4% Hispanic).

Cassia County's Native American/Other Population

395 residents of Cassia County, or 1.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Cassia County is comparable to the share in Idaho overall, where 1.5% of the population is Native American/Other. Cassia County ranks 31st statewide in terms of Native American/Other residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's Native American/Other population has grown by an estimated 71.0%. Native American/Other residents' share of Cassia County's population has increased from 0.9% to 1.6%.

Cassia County is more Native American/Other than neighboring Minidoka County (1.5% Native American/Other), Jerome County (0.2% Native American/Other), Power County (0.9% Native American/Other), Lincoln County (0.6% Native American/Other), and Box Elder County (0.9% Native American/Other).

Cassia County's Multiracial Population

838 residents of Cassia County, or 3.3% of the population, identify as Multiracial. The share of Multiracial residents in Cassia County is comparable to the share in Idaho overall, where 4.2% of the population is Multiracial. Cassia County ranks 43rd statewide in terms of Multiracial residents as a share of the population, out of 44 counties.

Since the 2020 Census, Cassia County's Multiracial population has grown by an estimated 60.8%. Multiracial residents' share of Cassia County's population has increased from 2.1% to 3.3%.

Cassia County is more Multiracial than neighboring Minidoka County (2.3% Multiracial), and Box Elder County (2.6% Multiracial). Cassia County is less Multiracial than neighboring Jerome County (3.6% Multiracial), Power County (3.9% Multiracial), and Lincoln County (3.9% 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.