Mills County Demographics

A map of Mills County's Population by Race

Mills County, Iowa has an estimated population of 14,568, a less than 1% change from the 14,484 recorded in the 2020 Census. The population is 92.7% White, 3.9% Hispanic, 2.3% Multiracial, 0.5% Asian, 0.4% Black, and 0.2% Native American/Other. This demographic dot map shows the population of Mills County, with one dot drawn for each person counted by the Census, color-coded by race.

Mills has become less racially diverse since the 2020 Census. It is considerably less diverse than Iowa overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Mills County, that probability was 15.1% in 2020 and 13.9% in the most recent ACS estimates.

Mills County is ranked the 53rd most populous county in Iowa, out of 99 counties. Mills County was ranked the 54th most populous county in the 2020 Census.

Mills County's White Population

13,503 residents of Mills County, or 92.7% of the population, identify as White. The share of White residents in Mills County is considerably higher than in Iowa overall, where 82.3% of the population is White. Mills County ranks 48th statewide in terms of White residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's White population has grown by an estimated 1.3%. White residents' share of Mills County's population has increased from 92.0% to 92.7%.

Mills County is more White than neighboring Fremont County (91.4% White), Pottawattamie County (84.5% White), Montgomery County (92% White), Sarpy County (76.3% White), and Cass County (90.5% White).

Mills County's Black Population

59 residents of Mills County, or 0.4% of the population, identify as Black. The share of Black residents in Mills County is slightly lower than in Iowa overall, where 3.8% of the population is Black. Mills County ranks 64th statewide in terms of Black residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's Black population has declined by an estimated 23.4%. Black residents' share of Mills County's population has remained roughly unchanged at 0.4%.

Mills County is more Black than neighboring Cass County (0.3% Black). Mills County is less Black than neighboring Pottawattamie County (1.8% Black), Montgomery County (1.8% Black), and Sarpy County (4% Black).

Mills County's Asian Population

66 residents of Mills County, or 0.5% of the population, identify as Asian. The share of Asian residents in Mills County is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Mills County ranks 70th statewide in terms of Asian residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's Asian population has grown by an estimated 37.5%. Asian residents' share of Mills County's population has remained roughly unchanged at 0.5%.

Mills County is more Asian than neighboring Fremont County (0.2% Asian), and Cass County (0.3% Asian). Mills County is less Asian than neighboring Pottawattamie County (0.9% Asian), Montgomery County (1.1% Asian), and Sarpy County (2.8% Asian).

Mills County's Hispanic Population

563 residents of Mills County, or 3.9% of the population, identify as Hispanic. The share of Hispanic residents in Mills County is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Mills County ranks 52nd statewide in terms of Hispanic residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's Hispanic population has grown by an estimated 22.1%. Hispanic residents' share of Mills County's population has increased from 3.2% to 3.9%.

Mills County is more Hispanic than neighboring Fremont County (3.4% Hispanic), and Montgomery County (0.8% Hispanic). Mills County is less Hispanic than neighboring Pottawattamie County (9.1% Hispanic), Sarpy County (11.6% Hispanic), and Cass County (4.1% Hispanic).

Mills County's Native American/Other Population

35 residents of Mills County, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Mills County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Mills County ranks 55th statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's Native American/Other population has declined by an estimated 43.5%. Native American/Other residents' share of Mills County's population has remained roughly unchanged at 0.2%.

Mills County is more Native American/Other than neighboring Fremont County (0.1% Native American/Other). Mills County is less Native American/Other than neighboring Pottawattamie County (0.7% Native American/Other), Montgomery County (1.1% Native American/Other), Sarpy County (0.9% Native American/Other), and Cass County (1.3% Native American/Other).

Mills County's Multiracial Population

342 residents of Mills County, or 2.3% of the population, identify as Multiracial. The share of Multiracial residents in Mills County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Mills County ranks 13th statewide in terms of Multiracial residents as a share of the population, out of 99 counties.

Since the 2020 Census, Mills County's Multiracial population has declined by an estimated 32.4%. Multiracial residents' share of Mills County's population has decreased from 3.5% to 2.3%.

Mills County is less Multiracial than neighboring Fremont County (4.6% Multiracial), Pottawattamie County (3% Multiracial), Montgomery County (3.2% Multiracial), Sarpy County (4.5% Multiracial), and Cass County (3.6% 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.