Union: Demographics & People
Census counts 7,037 people in Union, in 2,848 households. Population grew 1.5% from 6,930 (2022) to 7,037 (2024). Median age 36.8 years. (2.0y younger than Montgomery County; 1.3y younger than Ohio). Children under 18 are 26% of the population. Population is 83% White (non-Hispanic) and 5% Black. The community is relatively homogeneous (Simpson index 0.08). 61% of households are family-led. County is gaining 1,755 residents per year (2022-2023). County health: 40% adult obesity, 16% smoke.
- 2.5 people per household (vs Ohio avg 2.4).
- 39% non-family households (singles, roommates) (vs Ohio 44%).
- 90 dependents per 100 working-age (youth + seniors / 18-64) (vs Ohio 67).
Population & Trend
Population grew 1.5% from 6,930 (2022) to 7,037 (2024) — about 2.6× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~7,145 (extrapolated at 0.8%/yr trend). Census Bureau Vintage estimate: 7,292.
| Census data vintage | 2024 |
|---|---|
| Population | 108,774 people |
| Annual growth rate · Population change | 1.5% |
| Annual growth rate · Population (2022) | 6,930 |
| Annual growth rate · Population (2024) | 7,037 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 7,037 people (vs Ohio 29,269) |
| Population Estimate | 7,292 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.8y is 2.1 years younger than the U.S. median (38.9y). Children under 18 make up 26% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.8 years (vs Ohio 38.1y) |
|---|---|
| Age Summary · Children Pct | 26.5% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 7,037 |
| Age Summary · Under 18 | 1,866 |
| Age Summary · 18 To 34 | 1,247.0× |
| Age Summary · 35 To 64 | 2,455.0× |
| Age Summary · 65 Plus | 1,469 |
| Population under 18 | 1,866 |
| Median age | 36.8 years (vs Ohio 38.1y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 7,037 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.08 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 6,290 |
|---|---|
| Black residents | 183 |
| Asian residents | 9 |
| Hispanic or Latino residents | 89 |
| Diversity Index · Diversity index (Simpson) | 8.3% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 95.7% |
| Asian population | 0.2% (vs Ohio 1.9%) |
| Black population | 5.3% (vs Ohio 8.0%) |
| Hispanic or Latino population | 1.2% (vs Ohio 4.5%) |
| White (non-Hispanic) population | 82.6% (vs Ohio 77.9%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 0.6% are foreign-born — below the U.S. average of 13.9%. 0% have naturalized to U.S. citizenship.
| Residents born in this state | 5,844 |
|---|---|
| Residents born in another state | 1,127 |
| Share born in this state | 83.0% |
| Share born in another state | 17.0% |
| Native-born U.S. citizens | 16.0% |
| Foreign-born residents | 0.6% |
| Naturalized citizens | 0.4% |
| Total foreign-born residents | 63 |
Households & Family Composition
2,848 households. Averaging 2.4 people each — matches the U.S. average of 2.5. 61% are family households — below the U.S. share of ~65%. Of 1,775 families, 35% are married couples with children.
| Children under 18 | 1,835 |
|---|---|
| Total families | 1,775 |
| Married couples with children | 630 |
| Single-parent households | 51 |
| Average household size | 2.44 |
| Women who gave birth (past year) | 13.9% |
| Grandparents living with grandchildren | 8 |
| Family households | 1,745 households (vs Ohio 7,027) |
| Households that are families | 61.3% (vs Ohio 55.9%) |
| Total households | 2,848 households (vs Ohio 12,056) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 16.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 1,755 residents per year on net (IRS migration data).
| Moved within the county (past year) | 16.5% |
|---|---|
| Migration · People moving in (annual) | 106,894 |
| Migration · People moving out (annual) | 105,139 |
| Migration · Net migration (in − out) | 1,755 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 327 |
|---|---|
| Disability rate | 4.8% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 5 residents live in group quarters (0.1% of population).
| Living in group quarters | 5 |
|---|
Other
| Congressional District · District | 10 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 39109 |
| Cdc Birth Rate · State Fips | 39 |
| Cdc Birth Rate · County Fips | 109 |
| Cdc Birth Rate · County | Miami |
| Cdc Birth Rate · Birth Rate | 22.1% |
| Cdc Birth Rate · Lower Ci | 19.60 |
| Cdc Birth Rate · Upper Ci | 24.70 |
| Cdc Mortality · Fips | 39109 |
| Cdc Mortality · County | Miami County |
| Cdc Mortality · Urban Rural | Medium metro |
| Cdc Mortality · Total Deaths 2020 2023 | 4,126 |
| Cdc Vaccination · Fips | 39109 |
| Cdc Vaccination · County | Miami County |
| Cdc Vaccination · Dose1 Pop Pct | 52.5% |
| Cdc Vaccination · Series Complete Pct | 49.2% |
| Cdc Vaccination · Booster Pct | 51.7% |
| Cdc Vaccination · Population 2019 | 106,987 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 1.50 |
| Family Score · Schools | 1 |
| Family Score · Children Pct | 26.5% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 7,037, growing, family-oriented, middle-class, mixed |
| Town Summary · Population | 7,037 people (vs Ohio 29,269) |
| Town Summary · County | Miami County |
Sources: NCES school congressional district assignment · federal dataset cascade