Butler County Demographics
A map of Butler County's Population by Race
Butler County, Iowa has an estimated population of 14,268, a less than 1% change from the 14,334 recorded in the 2020 Census. The population is 94.6% White, 1.7% Hispanic, 1.6% Multiracial, 1.3% Asian, 0.7% Native American/Other, and 0.2% Black. This demographic dot map shows the population of Butler County, with one dot drawn for each person counted by the Census, color-coded by race.
Butler has become more 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 Butler County, that probability was 7.9% in 2020 and 10.5% in the most recent ACS estimates.
Butler County is ranked the 55th most populous county in Iowa, out of 99 counties. Butler County was ranked the 55th most populous county in the 2020 Census.
Butler County's White Population
13,493 residents of Butler County, or 94.6% of the population, identify as White. The share of White residents in Butler County is considerably higher than in Iowa overall, where 82.3% of the population is White. Butler County ranks 1st statewide in terms of White residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's White population has declined by an estimated 1.9%. White residents' share of Butler County's population has decreased from 95.9% to 94.6%.
Butler County is more White than neighboring Floyd County (88.7% White), Franklin County (80.2% White), Bremer County (92.3% White), and Black Hawk County (78.1% White). Butler County is less White than neighboring Grundy County (94.9% White).
Butler County's Black Population
24 residents of Butler County, or 0.2% of the population, identify as Black. The share of Black residents in Butler County is slightly lower than in Iowa overall, where 3.8% of the population is Black. Butler County ranks 94th statewide in terms of Black residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's Black population has declined by an estimated 7.7%. Black residents' share of Butler County's population has remained roughly unchanged at 0.2%.
Butler County is less Black than neighboring Floyd County (1.4% Black), Grundy County (0.6% Black), Franklin County (0.7% Black), Bremer County (1.1% Black), and Black Hawk County (9.1% Black).
Butler County's Asian Population
179 residents of Butler County, or 1.3% of the population, identify as Asian. The share of Asian residents in Butler County is comparable to the share in Iowa overall, where 2.5% of the population is Asian. Butler County ranks 93rd statewide in terms of Asian residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's Asian population has grown by an estimated 539.3%. Asian residents' share of Butler County's population has increased from 0.2% to 1.3%.
Butler County is more Asian than neighboring Grundy County (0.5% Asian), Franklin County (0.4% Asian), and Bremer County (0.9% Asian). Butler County is less Asian than neighboring Floyd County (1.6% Asian), and Black Hawk County (2.7% Asian).
Butler County's Hispanic Population
249 residents of Butler County, or 1.7% of the population, identify as Hispanic. The share of Hispanic residents in Butler County is lower than in Iowa overall, where 7.3% of the population is Hispanic. Butler County ranks 95th statewide in terms of Hispanic residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's Hispanic population has grown by an estimated 36.1%. Hispanic residents' share of Butler County's population has remained roughly unchanged at 1.7%.
Butler County is less Hispanic than neighboring Floyd County (3.9% Hispanic), Grundy County (1.8% Hispanic), Franklin County (16.5% Hispanic), Bremer County (2.1% Hispanic), and Black Hawk County (5.2% Hispanic).
Butler County's Native American/Other Population
98 residents of Butler County, or 0.7% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Butler County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Butler County ranks 84th statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's Native American/Other population has grown by an estimated 180.0%. Native American/Other residents' share of Butler County's population has remained roughly unchanged at 0.7%.
Butler County is more Native American/Other than neighboring Floyd County (0.1% Native American/Other), and Franklin County (0.5% Native American/Other). Butler County is less Native American/Other than neighboring Grundy County (1.2% Native American/Other), Bremer County (1.1% Native American/Other), and Black Hawk County (1% Native American/Other).
Butler County's Multiracial Population
225 residents of Butler County, or 1.6% of the population, identify as Multiracial. The share of Multiracial residents in Butler County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Butler County ranks 74th statewide in terms of Multiracial residents as a share of the population, out of 99 counties.
Since the 2020 Census, Butler County's Multiracial population has declined by an estimated 27.7%. Multiracial residents' share of Butler County's population has decreased from 2.2% to 1.6%.
Butler County is more Multiracial than neighboring Grundy County (1.1% Multiracial). Butler County is less Multiracial than neighboring Floyd County (4.4% Multiracial), Franklin County (1.8% Multiracial), Bremer County (2.6% Multiracial), and Black Hawk 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.