Population 110,296 · Census ACS 2020–24
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Population and households in Miami County
Household size in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.48 | 2.43 | 2.51 | 2.68 |
| 2010–14 | 2.53 | 2.42 | 2.51 | 2.73 |
| 2015–19 | 2.59 | 2.39 | 2.47 | 2.71 |
| 2020–24 | 2.50 | 2.37 | 2.46 | 2.65 |
| Change | +0.01 | −0.06 | −0.05 | −0.03 |
The average household in Miami County has 2.50 people, a bit under the U.S. average of 2.65. Even so, the typical household here is bigger than in the Dayton area overall, where it has 2.37 people. The biggest households, usually families with children, are concentrated in the south.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 40.4 | 39.5 | 39.0 | 37.7 |
| 2010–14 | 41.5 | 40.5 | 40.0 | 38.6 |
| 2015–19 | 42.1 | 41.0 | 40.7 | 39.6 |
| 2020–24 | 42.1 | 41.0 | 40.8 | 40.1 |
| Change | +1.7 | +1.5 | +1.8 | +2.3 |
Miami County skews a little older than the country: its median age is 42.1, against 40.1 nationally. Since 2006–10, the median age has climbed from 40.4, mirroring the country. The youngest areas are in the center, the oldest in the south.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 9.5% | 12.4% | 11.7% | 12.3% |
| 2010–14 | 11.2% | 12.6% | 11.9% | 12.3% |
| 2015–19 | 9.0% | 12.2% | 11.7% | 11.6% |
| 2020–24 | 9.5% | 11.5% | 11.7% | 11.6% |
| Change | +0.0 pts | −0.9 pts | −0.0 pts | −0.6 pts |
Single-parent households are less common in Miami County than nationally: 9.5%, against 11.6%. Compared with other Ohio counties, Miami County has a lower share of single-parent households than most.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Miami County
Renters in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 28.7% | 33.9% | 30.8% | 33.3% |
| 2010–14 | 29.5% | 36.2% | 33.1% | 35.6% |
| 2015–19 | 28.9% | 36.8% | 33.9% | 36.0% |
| 2020–24 | 26.6% | 35.0% | 32.8% | 34.8% |
| Change | −2.1 pts | +1.1 pts | +2.0 pts | +1.5 pts |
Just over a quarter of households in Miami County rent their homes (26.6%), below the national share of 34.8%; the rest own. Among homeowners, 36.5% have no mortgage at all, below the national share of 39.8%. Rentals cluster in the center; owners are most common in the south. The renter share has fallen 2.1 points since 2006–10, even as the national share rose.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.6% | 10.8% | 10.8% | 11.4% |
| 2010–14 | 8.3% | 10.7% | 10.8% | 11.4% |
| 2015–19 | 9.0% | 10.6% | 10.2% | 11.1% |
| 2020–24 | 5.9% | 8.0% | 8.7% | 9.6% |
| Change | −1.7 pts | −2.8 pts | −2.2 pts | −1.8 pts |
Fewer homes sit empty in Miami County than nationally: 5.9%, against 9.6% for the U.S. Vacancy has fallen 1.7 points since 2006–10, as it has nationally. Miami County has a lower vacancy rate than the great majority of Ohio counties.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 1965 | 1967 | 1968 | 1974 |
| 2010–14 | 1967 | 1967 | 1969 | 1975 |
| 2015–19 | 1969 | 1968 | 1970 | 1977 |
| 2020–24 | 1973 | 1970 | 1972 | 1980 |
| Change | +8 | +3 | +4 | +6 |
Homes in Miami County run older than the national norm, with a median build year of 1973 against 1980. The median year built has moved up from 1965 in 2006–10, a sign of steady new building. Newer construction is concentrated in the south, while the north has the oldest housing.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | $755 | $775 | $765 | $965 |
| 2010–14 | $806 | $843 | $814 | $1,040 |
| 2015–19 | $810 | $893 | $901 | $1,213 |
| 2020–24 | $1,041 | $1,166 | $1,142 | $1,571 |
| Change | +$286 | +$391 | +$377 | +$606 |
The median renter in Miami County pays $1,041 a month for rent and utilities, well below the national median of $1,571. Rents are up $286 a month from 2006–10, a 38% rise, a slower climb than the nation's. Rent takes 28.7% of the typical renter's income, just under the 30% mark often used to define affordable rent. Renters on a budget will find the lowest rents in the northwest; the highest are in the southeast.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Miami County
Bachelor's degrees in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 20.6% | 26.7% | 25.4% | 28.4% |
| 2010–14 | 20.4% | 27.3% | 26.5% | 29.6% |
| 2015–19 | 23.9% | 30.0% | 28.9% | 32.1% |
| 2020–24 | 27.7% | 33.6% | 31.9% | 35.6% |
| Change | +7.1 pts | +6.9 pts | +6.5 pts | +7.2 pts |
More than a quarter of adults 25 and older in Miami County (27.7%) have a bachelor's degree or higher, below the national share of 35.6%. The share with a degree is up 7.1 points from 2006–10, in line with the national trend. College graduates are most concentrated in the south and least in the northwest.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 87.9% | 88.7% | 87.7% | 84.9% |
| 2010–14 | 89.0% | 89.4% | 88.9% | 86.1% |
| 2015–19 | 91.3% | 91.0% | 90.4% | 87.7% |
| 2020–24 | 92.5% | 92.9% | 91.7% | 89.3% |
| Change | +4.6 pts | +4.2 pts | +4.0 pts | +4.3 pts |
High school completion in Miami County is a bit above the national rate: 92.5% of adults have a diploma or equivalent, against 89.3%. That is in line with the rest of the Dayton area. The share with a diploma is up 4.6 points from 2006–10, mirroring the country.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Miami County
| Period | Miami County | Dayton area | Ohio | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.2% | 8.6% | 8.7% | 8.1% |
| 2010–14 | 8.6% | 10.0% | 9.4% | 9.4% |
| 2015–19 | 4.9% | 6.2% | 5.5% | 5.6% |
| 2020–24 | 3.0% | 5.0% | 4.9% | 5.4% |
| Change | −3.2 pts | −3.6 pts | −3.8 pts | −2.7 pts |
Unemployment in Miami County has been low: just 3.0% of the labor force was out of work and looking, well below the national rate of 5.4%. Since 2006–10, unemployment has fallen 3.2 points, as it has nationally. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Miami County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Miami County | 2.50 | 42.1 | 9.5% | 26.6% | 5.9% | 1973 | $1,041 | 27.7% | 92.5% | 3.0% |
| Darke County | 2.46 | 42.1 | 10.0% | 27.6% | 6.5% | 1961 | $819 | 16.7% | 90.9% | 2.8% |
| Clark County | 2.42 | 42.3 | 13.6% | 30.6% | 9.3% | 1963 | $954 | 20.1% | 88.9% | 6.8% |
| Champaign County | 2.49 | 43.2 | 9.8% | 23.2% | 8.6% | 1967 | $952 | 19.2% | 91.3% | 4.7% |
| Randolph County | 2.34 | 42.1 | 13.0% | 22.7% | 9.7% | 1956 | $779 | 14.6% | 91.1% | 4.2% |
| Madison County | 2.64 | 41.7 | 10.1% | 22.5% | 7.3% | 1974 | $999 | 25.3% | 89.8% | 4.6% |
| Henry County | 2.53 | 43.0 | 12.8% | 23.8% | 12.6% | 1960 | $856 | 17.8% | 90.4% | 4.0% |
| Franklin County | 2.47 | 36.2 | 14.5% | 47.2% | 8.9% | 1979 | $1,393 | 41.6% | 91.0% | 4.8% |
| Madison County | 2.42 | 41.6 | 13.3% | 29.8% | 10.3% | 1967 | $1,037 | 20.4% | 90.8% | 5.9% |
| Licking County | 2.67 | 40.4 | 10.2% | 26.3% | 7.1% | 1980 | $1,197 | 29.9% | 93.4% | 3.3% |
| Hamilton County | 2.73 | 39.1 | 7.3% | 23.9% | 5.7% | 1999 | $1,739 | 62.8% | 97.4% | 2.7% |
All figures 2020–24.
Counties with similar populations: Maury County, TN · Pennington County, SD · Oswego County, NY · Ontario County, NY · Newton County, GA · Nevada County, CA · Navajo County, AZ · Moore County, NC · Montgomery County, VA · Missoula County, MT
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Miami County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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