St. Henry: Demographics & People
Census counts 2,741 people in St. Henry, in 889 households. Population shrank 2.5% from 2,812 (2022) to 2,741 (2024). Median age 33.3 years. (6.1y younger than Mercer County; 6.5y younger than Ohio). Children under 18 are 34% of the population. Population is 94% White (non-Hispanic) and 5% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.06). 80% of households are family-led. County is losing 588 residents per year (2022-2023). County health: 38% adult obesity, 20% smoke.
- 3.1 people per household.
- 20% non-family households (singles, roommates).
Population & Trend
Population shrank 2.5% from 2,812 (2022) to 2,741 (2024). Estimated 2026 population: ~2,672 (extrapolated at -1.3%/yr trend). Census Bureau Vintage estimate: 2,582.
| Census data vintage | 2024 |
|---|---|
| Population | 42,528 people |
| Annual growth rate · Population change | -2.5% |
| Annual growth rate · Population (2022) | 2,812 |
| Annual growth rate · Population (2024) | 2,741 |
| Annual growth rate · Trend category | declining |
| Population | 2,741 people |
| Population Estimate | 2,582 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 33.3y is 5.6 years younger than the U.S. median (38.9y). Children under 18 make up 34% — above the U.S. share of ~22%.
| Age Summary · Median age | 33.3 years (vs Ohio 39.8y) |
|---|---|
| Age Summary · Children Pct | 33.7% |
| Age Summary · Character | young professional |
| Population under 18 | 924 |
| Median age | 33.3 years (vs Ohio 39.8y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 2,741 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.06 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 2,764 |
|---|---|
| Asian residents | 4 |
| Hispanic or Latino residents | 82 |
| Diversity Index · Diversity index (Simpson) | 5.9% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 97.0% |
| Asian population | 0.3% |
| Hispanic or Latino population | 5.1% |
| White (non-Hispanic) population | 94.0% |
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). 0.3% are foreign-born — below the U.S. average of 13.9%. 3% have naturalized to U.S. citizenship.
| Residents born in this state | 2,452 |
|---|---|
| Residents born in another state | 195 |
| Share born in this state | 89.5% |
| Share born in another state | 10.5% |
| Native-born U.S. citizens | 7.1% |
| Foreign-born residents | 0.3% |
| Naturalized citizens | 3.1% |
| Total foreign-born residents | 23 |
Households & Family Composition
889 households. Averaging 3.1 people each — larger than the U.S. average of 2.5. 80% are family households — above the U.S. share of ~65%. Of 703 families, 48% are married couples with children.
| Children under 18 | 957 |
|---|---|
| Total families | 703 |
| Married couples with children | 340 |
| Single-parent households | 24 |
| Average household size | 3.08 |
| Women who gave birth (past year) | 3.9% |
| Grandparents living with grandchildren | 510 |
| Grandparents responsible for grandchildren | 130 |
| Family households | 716 households |
| Households that are families | 80.5% |
| Total households | 889 households |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 9.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 588 residents per year on net (IRS migration data).
| Moved within the county (past year) | 9.1% |
|---|---|
| Migration · People moving in (annual) | 41,212 |
| Migration · People moving out (annual) | 41,800 |
| Migration · Net migration (in − out) | -588 |
| 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 | 126 |
|---|---|
| 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. 52 residents live in group quarters (1.9% of population).
| Living in group quarters | 52 |
|---|
Other
| Congressional District · District | 5 |
|---|---|
| Congressional District · Formatted | OH-05 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 39,107 |
| Cdc Birth Rate · State Fips | 39 |
| Cdc Birth Rate · County Fips | 107 |
| Cdc Birth Rate · County | Mercer |
| Cdc Birth Rate · Birth Rate | 14.2% |
| Cdc Birth Rate · Lower Ci | 11.40 |
| Cdc Birth Rate · Upper Ci | 17.40 |
| Cdc Mortality · Fips | 39,107 |
| Cdc Mortality · County | Mercer County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 1,216 |
| Cdc Vaccination · Fips | 39,107 |
| Cdc Vaccination · County | Mercer County |
| Cdc Vaccination · Dose1 Pop Pct | 41.6% |
| Cdc Vaccination · Series Complete Pct | 39.2% |
| Cdc Vaccination · Booster Pct | 53.9% |
| Cdc Vaccination · Population 2019 | 41,172 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 10 |
| Family Score · Schools | 19 |
| Family Score · Children Pct | 33.7% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 2,741, declining, young professional, affluent, mixed |
| Town Summary · Population | 2,741 people |
| Town Summary · County | Mercer County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade