Madison County Demographics

A map of Madison County's Population by Race

Madison County, Iowa has an estimated population of 16,926, a slight increase from the 16,548 recorded in the 2020 Census. The population is 94.3% White, 2.3% Hispanic, 2.2% Multiracial, 0.7% Black, 0.4% Asian, and 0.1% Native American/Other. This demographic dot map shows the population of Madison County, with one dot drawn for each person counted by the Census, color-coded by race.

Madison 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 Madison County, that probability was 12.1% in 2020 and 11.1% in the most recent ACS estimates.

Madison County is ranked the 42nd most populous county in Iowa, out of 99 counties. Madison County was ranked the 45th most populous county in the 2020 Census.

Madison County's White Population

15,953 residents of Madison County, or 94.3% of the population, identify as White. The share of White residents in Madison County is considerably higher than in Iowa overall, where 82.3% of the population is White. Madison County ranks 25th statewide in terms of White residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's White population has grown by an estimated 2.9%. White residents' share of Madison County's population has increased from 93.7% to 94.3%.

Madison County is more White than neighboring Dallas County (80.9% White), Union County (91.9% White), Clarke County (77.5% White), Warren County (91.9% White), and Adair County (93.1% White).

Madison County's Black Population

125 residents of Madison County, or 0.7% of the population, identify as Black. The share of Black residents in Madison County is slightly lower than in Iowa overall, where 3.8% of the population is Black. Madison County ranks 85th statewide in terms of Black residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's Black population has grown by an estimated 184.1%. Black residents' share of Madison County's population has remained roughly unchanged at 0.7%.

Madison County is more Black than neighboring Clarke County (0.1% Black). Madison County is less Black than neighboring Dallas County (3% Black), Union County (0.8% Black), and Adair County (1.4% Black).

Madison County's Asian Population

76 residents of Madison County, or 0.4% of the population, identify as Asian. The share of Asian residents in Madison County is slightly lower than in Iowa overall, where 2.5% of the population is Asian. Madison County ranks 45th statewide in terms of Asian residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's Asian population has declined by an estimated 8.4%. Asian residents' share of Madison County's population has remained roughly unchanged at 0.4%.

Madison County is more Asian than neighboring Adair County (0.3% Asian). Madison County is less Asian than neighboring Dallas County (4.9% Asian), Union County (0.9% Asian), Clarke County (0.6% Asian), and Warren County (0.7% Asian).

Madison County's Hispanic Population

383 residents of Madison County, or 2.3% of the population, identify as Hispanic. The share of Hispanic residents in Madison County is slightly lower than in Iowa overall, where 7.3% of the population is Hispanic. Madison County ranks 84th statewide in terms of Hispanic residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's Hispanic population has grown by an estimated 21.2%. Hispanic residents' share of Madison County's population has remained roughly unchanged at 2.3%.

Madison County is less Hispanic than neighboring Dallas County (6.9% Hispanic), Union County (3.8% Hispanic), Clarke County (16.8% Hispanic), Warren County (3.7% Hispanic), and Adair County (3.2% Hispanic).

Madison County's Native American/Other Population

20 residents of Madison County, or 0.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Madison County is comparable to the share in Iowa overall, where 0.6% of the population is Native American/Other. Madison County ranks 47th statewide in terms of Native American/Other residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's Native American/Other population has declined by an estimated 75.3%. Native American/Other residents' share of Madison County's population has remained roughly unchanged at 0.1%.

Madison County is less Native American/Other than neighboring Dallas County (0.5% Native American/Other), Union County (0.2% Native American/Other), Clarke County (0.2% Native American/Other), Warren County (0.2% Native American/Other), and Adair County (0.7% Native American/Other).

Madison County's Multiracial Population

369 residents of Madison County, or 2.2% of the population, identify as Multiracial. The share of Multiracial residents in Madison County is comparable to the share in Iowa overall, where 3.5% of the population is Multiracial. Madison County ranks 23rd statewide in terms of Multiracial residents as a share of the population, out of 99 counties.

Since the 2020 Census, Madison County's Multiracial population has declined by an estimated 29.0%. Multiracial residents' share of Madison County's population has decreased from 3.1% to 2.2%.

Madison County is more Multiracial than neighboring Adair County (1.4% Multiracial). Madison County is less Multiracial than neighboring Dallas County (3.9% Multiracial), Union County (2.4% Multiracial), Clarke County (4.9% Multiracial), and Warren County (2.8% 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.