Miami County Demographics

A map of Miami County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	99,179	96,964	89.9%	89.1%
Multiracial	4,308	4,752	3.9%	4.4%
Hispanic	2,366	2,199	2.1%	2.0%
Asian	2,062	1,644	1.9%	1.5%
Black	1,962	2,559	1.8%	2.4%
Native American/Other	419	656	0.4%	0.6%

Miami County, Ohio has an estimated population of 110,296, a slight increase from the 108,774 recorded in the 2020 Census. The population is 89.9% White, 3.9% Multiracial, 2.1% Hispanic, 1.9% Asian, 1.8% Black, and 0.4% Native American/Other. 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 Ohio 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 18.9% in the most recent ACS estimates.

Miami County is ranked the 25th most populous county in Ohio, out of 88 counties. Miami County was ranked the 25th most populous county in the 2020 Census.

Miami County's White Population

99,179 residents of Miami County, or 89.9% of the population, identify as White. The share of White residents in Miami County is considerably higher than in Ohio overall, where 75.8% of the population is White. Miami County ranks 50th statewide in terms of White residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's White population has grown by an estimated 2.3%. White residents' share of Miami County's population has increased from 89.1% to 89.9%.

Miami County is more White than neighboring Montgomery County (67.7% White), and Clark County (81.7% White). Miami County is less White than neighboring Shelby County (91.5% White), Darke County (94.6% White), and Champaign County (91.7% White).

Miami County's Black Population

1,962 residents of Miami County, or 1.8% of the population, identify as Black. The share of Black residents in Miami County is considerably lower than in Ohio overall, where 12% of the population is Black. Miami County ranks 37th statewide in terms of Black residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's Black population has declined by an estimated 23.3%. Black residents' share of Miami County's population has decreased from 2.4% to 1.8%.

Miami County is more Black than neighboring Darke County (0.6% Black), and Champaign County (1.6% Black). Miami County is less Black than neighboring Shelby County (2.2% Black), Montgomery County (20.4% Black), and Clark County (8% Black).

Miami County's Asian Population

2,062 residents of Miami County, or 1.9% of the population, identify as Asian. The share of Asian residents in Miami County is comparable to the share in Ohio overall, where 2.5% of the population is Asian. Miami County ranks 18th statewide in terms of Asian residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's Asian population has grown by an estimated 25.4%. Asian residents' share of Miami County's population has remained roughly unchanged at 1.9%.

Miami County is more Asian than neighboring Shelby County (0.6% Asian), Darke County (0.5% Asian), Clark County (0.6% Asian), and Champaign County (0.5% Asian). Miami County is less Asian than neighboring Montgomery County (2.2% Asian).

Miami County's Hispanic Population

2,366 residents of Miami County, or 2.1% of the population, identify as Hispanic. The share of Hispanic residents in Miami County is slightly lower than in Ohio overall, where 4.8% of the population is Hispanic. Miami County ranks 50th statewide in terms of Hispanic residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's Hispanic population has grown by an estimated 7.6%. Hispanic residents' share of Miami County's population has remained roughly unchanged at 2.1%.

Miami County is more Hispanic than neighboring Shelby County (1.7% Hispanic), Darke County (1.9% Hispanic), and Champaign County (1.8% Hispanic). Miami County is less Hispanic than neighboring Montgomery County (4.2% Hispanic), and Clark County (4.2% Hispanic).

Miami County's Native American/Other Population

419 residents of Miami County, or 0.4% 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 Ohio overall, where 0.5% of the population is Native American/Other. Miami County ranks 18th statewide in terms of Native American/Other residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's Native American/Other population has declined by an estimated 36.1%. Native American/Other residents' share of Miami County's population has remained roughly unchanged at 0.4%.

Miami County is more Native American/Other than neighboring Darke County (0.1% Native American/Other), and Clark County (0.3% Native American/Other). Miami County is less Native American/Other than neighboring Montgomery County (0.5% Native American/Other), and Champaign County (0.7% Native American/Other).

Miami County's Multiracial Population

4,308 residents of Miami County, or 3.9% of the population, identify as Multiracial. The share of Multiracial residents in Miami County is comparable to the share in Ohio overall, where 4.3% of the population is Multiracial. Miami County ranks 23rd statewide in terms of Multiracial residents as a share of the population, out of 88 counties.

Since the 2020 Census, Miami County's Multiracial population has declined by an estimated 9.3%. Multiracial residents' share of Miami County's population has decreased from 4.4% to 3.9%.

Miami County is more Multiracial than neighboring Shelby County (3.5% Multiracial), Darke County (2.3% Multiracial), and Champaign County (3.6% Multiracial). Miami County is less Multiracial than neighboring Montgomery County (5% Multiracial), and Clark 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.