Miami County, Ohio Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 25th-largest in Ohio
The population of Miami County, Ohio is 109,549 as of the 2023 American Community Survey, making it the 25th-largest county in Ohio. The median household income is $74,175, the median home value is $209,200, and the median age is 41.1.
The population of Miami County has grown 9.2% since 2010 (102,487 → 111,950), a +0.63% annualized rate.
109,549
Population
+0.63%
Annual growth
269
People / sq mi
$74,175
Median Income
$209,200
Median Home Value
Miami County covers 407 sq mi of land at 269.4 people per square mile.
About Miami County, OH
What distinguishes Miami County is density: among the most densely settled of US counties, around 269 people per square mile. Miami County is a county in Ohio with a population of 109,549. It ranks #25 among counties in Ohio by population.
The typical household earns $74,175 a year, below the US median of $78,538. Poverty is relatively low for US counties at 5.7%, below the national 12.4%. The typical home is valued at $209,200, with typical rent around $942.
Roughly 24.9% of adults have a bachelor’s, below the national 35.0%. About 9.0% of the workforce is home-based, below the national 14.0%, and the average commute runs about 21 minutes each way.
That density explains much of the rest of the profile in Miami County: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Miami County Population History (2010-2024)
The county of Miami County had a population of 102,487 in 2010 and 111,950 in 2024, a 9.2% growth over 14 years. The peak was 111,950 in 2024. Average annual growth rate: 0.63%.
111,950
Population (2024)
102,487
Population (2010)
111,950
Peak (2024)
0.63%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 102,487 |
| 2011 | 102,742 |
| 2012 | 102,947 |
| 2013 | 103,228 |
| 2014 | 103,876 |
| 2015 | 104,100 |
| 2016 | 104,553 |
| 2017 | 105,215 |
| 2018 | 106,091 |
| 2019 | 106,995 |
| 2020 | 108,962 |
| 2021 | 109,426 |
| 2022 | 110,245 |
| 2023 | 110,898 |
| 2024 | 111,950 |
Race & Ethnicity
| White | 91.2% |
| Black or African American | 2.1% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.7% |
| Two or More Races | 0.0% |
Age & Sex
41.1
Median Age
50.3%
Female
49.7%
Male
19.1%
Age 65+
Age Distribution
Children (under 15): 18.8% · Seniors (65+): 19.1%
Income & Poverty
| Median household income | $74,175+$4,495 vs state |
| Mean household income | $94,300 |
| Per-capita income | $39,046 |
| Poverty rate | 5.7%-3.5% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 61.6% |
Top Industries by Employment
The largest employment sector in Miami County is manufacturing, accounting for 24.6% of workers.
How residents commute
0.2%
Drive alone
1.4%
Carpool
81.1%
Public transit
9.0%
Work from home
21.4 min
Avg commute
Housing
$209,200+$10,000 vs state
Median home value
$942
Median rent
73.4%
Homeownership rate
47,028
Total housing units
94.8%
Occupied
5.2%
Vacant
26.6%
Renter-occupied
Social & access
95.0%
With health insurance
94.5%
With broadband internet
16.3%
Foreign-born
7.8%
Veterans (18+)
12.6%
With a disability
96.5%
Speak language other than English at home
Education
92.8%
High School+
24.9%
Bachelor's+
Largest cities in Ohio
Other counties in Ohio
Part of Ohio
Metro areas in Ohio
County rankings
Frequently Asked Questions
Miami County, Ohio has a population of 109,549 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 25th-largest county in Ohio. Population density is 269 people per square mile.
The population of Miami County has grown 9.2% since 2010 (102,487 → 111,950), a +0.63% annualized rate.
The median household income in Miami County, Ohio is $74,175, with mean (average) household income of $94,300 and per-capita income of $39,046. 5.7% of residents live below the federal poverty level.
In Miami County, the largest racial and ethnic groups are White (91.2%), Black or African American (2.1%), Hispanic or Latino (0.7%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Miami County, Ohio is 41.1 years. Residents are 50.3% female and 49.7% male.
The median home value in Miami County is $209,200 and median monthly rent is $942. 73.4% of occupied housing units are owner-occupied. The county has 47,028 total housing units, 5.2% of which are vacant.
The largest employment sector in Miami County, Ohio is manufacturing, employing 24.6% of workers. The unemployment rate is 2.3%.
Columbus is among the largest cities associated with Miami County, Ohio, with a population of 906,480.
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Statewide data for Ohio
Population, race, income, age, and trends across Ohio
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.