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.
Miami County, OH Climate
Miami County, OH has an average annual temperature of 10.7°C (51°F) and receives about 956 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
10.7°C
Avg Temp
956
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -3° / 26° | 56 mm |
| February | -1° / 29° | 53 mm |
| March | 4° / 40° | 80 mm |
| April | 10° / 50° | 96 mm |
| May | 16° / 61° | 103 mm |
| June | 21° / 70° | 98 mm |
| July | 23° / 74° | 99 mm |
| August | 22° / 72° | 86 mm |
| September | 19° / 65° | 67 mm |
| October | 12° / 53° | 67 mm |
| November | 6° / 42° | 79 mm |
| December | 0° / 31° | 72 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Miami County, OH
The most comfortable months to visit Miami County, OH are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -8°C low). May is usually the wettest month.
Where to stay near Miami County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.