Miami County Demographics

A map of Miami County's Population by Race

Miami County, Kansas has an estimated population of 34,938, a slight increase from the 34,191 recorded in the 2020 Census. The population is 89.9% White, 4.5% Multiracial, 4.1% Hispanic, 1.2% Black, 0.2% Native American/Other, and 0.1% Asian. This demographic dot map shows the population of Miami County, with one dot drawn for each person counted by the Census, color-coded by race.

Miami has become less racially diverse since the 2020 Census. It is considerably less diverse than Kansas overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Miami County, that probability was 20.2% in 2020 and 18.8% in the most recent ACS estimates.

Miami County is ranked the 14th most populous county in Kansas, out of 105 counties. Miami County was ranked the 16th most populous county in the 2020 Census.

Miami County's White Population

31,401 residents of Miami County, or 89.9% of the population, identify as White. The share of White residents in Miami County is significantly higher than in Kansas overall, where 72.7% of the population is White. Miami County ranks 38th statewide in terms of White residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's White population has grown by an estimated 3.0%. White residents' share of Miami County's population has increased from 89.1% to 89.9%.

Miami County is more White than neighboring Johnson County (76.1% White), Franklin County (88.9% White), Cass County (83.6% White), and Wyandotte County (36.4% White). Miami County is less White than neighboring Linn County (91% White).

Miami County's Black Population

418 residents of Miami County, or 1.2% of the population, identify as Black. The share of Black residents in Miami County is slightly lower than in Kansas overall, where 5.2% of the population is Black. Miami County ranks 35th statewide in terms of Black residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's Black population has declined by an estimated 2.8%. Black residents' share of Miami County's population has remained roughly unchanged at 1.2%.

Miami County is more Black than neighboring Franklin County (1.1% Black). Miami County is less Black than neighboring Johnson County (4.8% Black), Linn County (1.4% Black), Cass County (4.6% Black), and Wyandotte County (18.1% Black).

Miami County's Asian Population

51 residents of Miami County, or 0.1% of the population, identify as Asian. The share of Asian residents in Miami County is slightly lower than in Kansas overall, where 2.9% of the population is Asian. Miami County ranks 44th statewide in terms of Asian residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's Asian population has declined by an estimated 68.3%. Asian residents' share of Miami County's population has remained roughly unchanged at 0.1%.

Miami County is less Asian than neighboring Johnson County (5.2% Asian), Linn County (0.2% Asian), Franklin County (0.6% Asian), Cass County (0.8% Asian), and Wyandotte County (5.2% Asian).

Miami County's Hispanic Population

1,423 residents of Miami County, or 4.1% of the population, identify as Hispanic. The share of Hispanic residents in Miami County is lower than in Kansas overall, where 13.6% of the population is Hispanic. Miami County ranks 79th statewide in terms of Hispanic residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's Hispanic population has grown by an estimated 19.0%. Hispanic residents' share of Miami County's population has increased from 3.5% to 4.1%.

Miami County is more Hispanic than neighboring Linn County (3.1% Hispanic). Miami County is less Hispanic than neighboring Johnson County (9.3% Hispanic), Franklin County (4.8% Hispanic), Cass County (5.5% Hispanic), and Wyandotte County (34.1% Hispanic).

Miami County's Native American/Other Population

74 residents of Miami 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 Miami County is comparable to the share in Kansas overall, where 0.9% of the population is Native American/Other. Miami County ranks 57th statewide in terms of Native American/Other residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's Native American/Other population has declined by an estimated 69.9%. Native American/Other residents' share of Miami County's population has remained roughly unchanged at 0.2%.

Miami County is less Native American/Other than neighboring Johnson County (0.5% Native American/Other), Linn County (0.7% Native American/Other), Franklin County (0.8% Native American/Other), Cass County (1.1% Native American/Other), and Wyandotte County (1.1% Native American/Other).

Miami County's Multiracial Population

1,571 residents of Miami County, or 4.5% of the population, identify as Multiracial. The share of Multiracial residents in Miami County is comparable to the share in Kansas overall, where 4.8% of the population is Multiracial. Miami County ranks 26th statewide in terms of Multiracial residents as a share of the population, out of 105 counties.

Since the 2020 Census, Miami County's Multiracial population has declined by an estimated 6.8%. Multiracial residents' share of Miami County's population has remained roughly unchanged at 4.5%.

Miami County is more Multiracial than neighboring Johnson County (4% Multiracial), Linn County (3.6% Multiracial), Franklin County (3.7% Multiracial), and Cass County (4.4% Multiracial). Miami County is less Multiracial than neighboring Wyandotte County (5.1% 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.