Montgomery County Demographics

A map of Montgomery County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
White	362,682	360,396	67.7%	67.1%
Black	109,097	112,818	20.4%	21.0%
Multiracial	26,975	26,433	5.0%	4.9%
Hispanic	22,744	21,179	4.2%	3.9%
Asian	12,029	12,714	2.2%	2.4%
Native American/Other	2,569	3,769	0.5%	0.7%

Montgomery County, Ohio has an estimated population of 536,096, a less than 1% change from the 537,309 recorded in the 2020 Census. The population is 67.7% White, 20.4% Black, 5.0% Multiracial, 4.2% Hispanic, 2.2% Asian, and 0.5% Native American/Other. This demographic dot map shows the population of Montgomery County, with one dot drawn for each person counted by the Census, color-coded by race.

Montgomery has become slightly less racially diverse since the 2020 Census. It is considerably more 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 Montgomery County, that probability was 50.1% in 2020 and 49.6% in the most recent ACS estimates.

Montgomery County is ranked the 5th most populous county in Ohio, out of 88 counties. Montgomery County was ranked the 5th most populous county in the 2020 Census.

Montgomery County's White Population

362,682 residents of Montgomery County, or 67.7% of the population, identify as White. The share of White residents in Montgomery County is lower than in Ohio overall, where 75.8% of the population is White. Montgomery County ranks 84th statewide in terms of White residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's White population has remained roughly the same. White residents' share of Montgomery County's population has increased from 67.1% to 67.7%.

Montgomery County is less White than neighboring Miami County (89.9% White), Warren County (81.8% White), Preble County (95% White), Greene County (81.3% White), and Butler County (74.6% White).

Montgomery County's Black Population

109,097 residents of Montgomery County, or 20.4% of the population, identify as Black. The share of Black residents in Montgomery County is higher than in Ohio overall, where 12% of the population is Black. Montgomery County ranks 4th statewide in terms of Black residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's Black population has declined by an estimated 3.3%. Black residents' share of Montgomery County's population has decreased from 21.0% to 20.4%.

Montgomery County is more Black than neighboring Miami County (1.8% Black), Warren County (3.2% Black), Preble County (0.7% Black), Greene County (5.8% Black), and Butler County (8.3% Black).

Montgomery County's Asian Population

12,029 residents of Montgomery County, or 2.2% of the population, identify as Asian. The share of Asian residents in Montgomery County is comparable to the share in Ohio overall, where 2.5% of the population is Asian. Montgomery County ranks 11th statewide in terms of Asian residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's Asian population has declined by an estimated 5.4%. Asian residents' share of Montgomery County's population has remained roughly unchanged at 2.2%.

Montgomery County is more Asian than neighboring Miami County (1.9% Asian), and Preble County (0.1% Asian). Montgomery County is less Asian than neighboring Warren County (7.2% Asian), Greene County (3% Asian), and Butler County (4.3% Asian).

Montgomery County's Hispanic Population

22,744 residents of Montgomery County, or 4.2% of the population, identify as Hispanic. The share of Hispanic residents in Montgomery County is comparable to the share in Ohio overall, where 4.8% of the population is Hispanic. Montgomery County ranks 24th statewide in terms of Hispanic residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's Hispanic population has grown by an estimated 7.4%. Hispanic residents' share of Montgomery County's population has remained roughly unchanged at 4.2%.

Montgomery County is more Hispanic than neighboring Miami County (2.1% Hispanic), Warren County (3.5% Hispanic), Preble County (1.1% Hispanic), and Greene County (3.3% Hispanic). Montgomery County is less Hispanic than neighboring Butler County (7% Hispanic).

Montgomery County's Native American/Other Population

2,569 residents of Montgomery County, or 0.5% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Montgomery County is comparable to the share in Ohio overall, where 0.5% of the population is Native American/Other. Montgomery County ranks 6th statewide in terms of Native American/Other residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's Native American/Other population has declined by an estimated 31.8%. Native American/Other residents' share of Montgomery County's population has remained roughly unchanged at 0.5%.

Montgomery County is more Native American/Other than neighboring Miami County (0.4% Native American/Other), and Preble County (0.3% Native American/Other). Montgomery County is less Native American/Other than neighboring Warren County (0.7% Native American/Other), Greene County (0.9% Native American/Other), and Butler County (0.6% Native American/Other).

Montgomery County's Multiracial Population

26,975 residents of Montgomery County, or 5.0% of the population, identify as Multiracial. The share of Multiracial residents in Montgomery County is comparable to the share in Ohio overall, where 4.3% of the population is Multiracial. Montgomery County ranks 8th statewide in terms of Multiracial residents as a share of the population, out of 88 counties.

Since the 2020 Census, Montgomery County's Multiracial population has grown by an estimated 2.1%. Multiracial residents' share of Montgomery County's population has remained roughly unchanged at 5.0%.

Montgomery County is more Multiracial than neighboring Miami County (3.9% Multiracial), Warren County (3.6% Multiracial), and Preble County (2.8% Multiracial). Montgomery County is less Multiracial than neighboring Greene County (5.8% Multiracial), and Butler County (5.3% 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.