Demographics of Miami County, Ohio

Miami County, Ohio had 112,634 people on July 1, 2025, by the Census Bureau’s estimate: +3,660 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Miami County, in four figures

112,634
Population: July 1, 2025, Vintage 2025 estimate.; +3.4%
Change since July 2020: +3,660 people.; 41.3 ±0.5
Median age: ACS 2020–⁠2024.; $76,817 ±$2,939
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Miami County, Ohio's population grew 3.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Miami County, Ohio's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Miami County, Ohio's population grew 3.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Miami County, Ohio's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	108,974	100.0	100.0
2021	109,392	100.4	100.2
2022	110,217	101.1	100.7
2023	110,925	101.8	101.6
2024	111,872	102.7	102.5
2025	112,634	103.4	103.1

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Population of Miami County, Ohio on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	108,974	+193	+42	+1	+119
2021	109,392	+418	−256	+50	+534
2022	110,217	+825	−397	+196	+1,058
2023	110,925	+708	−99	+148	+676
2024	111,872	+947	−89	+119	+925
2025	112,634	+762	−73	+88	+752

Age, 2020–2024

The median age is 41.3 ±0.5: for men 40.2 ±0.8 and for women 42.2 ±0.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Miami County by age, ACS 2020–2024
Age	People	Share	Ohio	United States
Under 5	6,153 ±166	5.6% ±0.2	5.7% ±<0.1	5.6% ±<0.1
5 to 17	19,090 ±708	17.3% ±0.6	16.3% ±0.1	16.3% ±<0.1
18 to 24	8,177 ±543	7.4% ±0.5	8.9% ±0.1	9.1% ±<0.1
25 to 44	26,828 ±810	24.3% ±0.7	25.7% ±0.1	26.9% ±<0.1
45 to 64	28,666 ±832	26.0% ±0.8	25.1% ±0.1	24.8% ±<0.1
65 and over	21,382 ±864	19.4% ±0.8	18.3% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $76,817 ±$2,939, and income per person $40,297 ±$946, in 2024 dollars. The median is $71,389 ±$321 in Ohio and $80,734 ±$166 in the United States.

Households by income

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Households in Miami County by income, ACS 2020–2024
Household income	Households	Share	Ohio	United States
Under $25,000	6,191 ±677	13.8% ±1.5	16.3% ±0.2	14.6% ±<0.1
$25,000 to $49,999	7,461 ±741	16.6% ±1.6	19.1% ±0.2	16.7% ±<0.1
$50,000 to $74,999	8,298 ±784	18.5% ±1.7	16.9% ±0.1	15.5% ±<0.1
$75,000 to $99,999	6,399 ±573	14.2% ±1.3	13.1% ±0.1	12.6% ±<0.1
$100,000 to $149,999	8,374 ±659	18.6% ±1.5	17.1% ±0.1	17.5% ±<0.1
$150,000 to $199,999	4,613 ±472	10.3% ±1.0	8.3% ±0.1	9.6% ±<0.1
$200,000 or more	3,570 ±412	7.9% ±0.9	9.1% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Miami County by age, ACS 2020–2024
Age	Below poverty	Rate	Ohio	United States
All ages	10,225 ±1,365	9.4% ±1.3	13.3% ±0.2	12.5% ±0.1
Under 18	2,714 ±505	10.9% ±2.0	17.8% ±0.3	16.1% ±0.1
18 to 59	5,093 ±812	9.1% ±1.4	12.7% ±0.2	11.6% ±0.1
60 and over	2,418 ±398	8.5% ±1.4	10.6% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in Miami County, ACS 2020–2024
Measure	Miami County	Ohio	United States
Housing units	47,226 ±66	5,292,391 ±464	143,775,355 ±10,234
Occupied	95.1% ±0.8	91.9% ±0.2	89.9% ±0.1
Vacant	4.9% ±0.8	8.1% ±0.2	10.1% ±0.1
Owner occupied	73.4% ±1.4	67.2% ±0.3	65.2% ±0.3
Renter occupied	26.6% ±1.5	32.8% ±0.2	34.8% ±0.1
Median home value	$229,100 ±$7,621	$214,800 ±$742	$332,700 ±$236
Median gross rent	$966 ±$34	$1,034 ±$5	$1,413 ±$2
Median year built	1971 ±2	1970 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Miami County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Ohio	United States
Hispanic or Latino	2,366 ±0	2.1% ±<0.1	4.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	99,179 ±284	89.9% ±0.3	75.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	1,962 ±418	1.8% ±0.4	12.0% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	2,062 ±192	1.9% ±0.2	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 47	0% to < 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 30	0% to < 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	198 to 596	0.2% to 0.5%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	4,308 ±478	3.9% ±0.4	4.3% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Miami County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Ohio	United States
Born in the state	87,818 ±1,166	79.6% ±1.1	74.6% ±0.1	57.3% ±<0.1
Born in another state	18,689 ±1,160	16.9% ±1.1	19.2% ±0.1	26.9% ±<0.1
Born a citizen outside the states	671 ±216	0.6% ±0.2	1.0% ±<0.1	1.7% ±<0.1
Born abroad	3,118 ±492	2.8% ±0.4	5.2% ±0.1	14.1% ±<0.1
Naturalized citizens	1,805 ±432	1.6% ±0.4	2.8% ±<0.1	7.4% ±<0.1
Not citizens	1,313 ±392	1.2% ±0.4	2.5% ±0.1	6.8% ±<0.1

Miami County among the counties of Ohio

25th of 88 by population, July 2025. Every one is listed on the Ohio page.

Counties of Ohio near Miami County in population, July 2025
County	July 2025	Change since 2020
Portage County	163,404	+1.0%
Clark County	135,340	−0.4%
Wood County	134,176	+1.5%
Richland County	124,893	−0.1%
Wayne County	116,758	−0.1%
Miami County	112,634	+3.4%
Allen County	100,881	−1.2%
Columbiana County	99,377	−2.2%
Ashtabula County	96,713	−0.8%
Geauga County	95,676	+0.3%
Tuscarawas County	92,373	−0.9%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026