Grissom AFBDemographics & People
About 2,977 people live in Grissom AFB, in 976 households. Population grew 3.3% from 2,882 (2022) to 2,977 (2024). Median age 28.1 years. (13.4y younger than Miami County; 9.9y younger than Indiana). Children under 18 are 27% of the population. Population is 73% White (non-Hispanic) and 8% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.23). 71% of households are family-led. County health: 40% adult obesity, 20% smoke.
- 3.1 people per household (vs Indiana avg 2.5).
- 29% non-family households (singles, roommates) (vs Indiana 42%).
- 60 dependents per 100 working-age (youth + seniors / 18-64) (vs Indiana 67).
Population & Trend
Population grew 3.3% from 2,882 (2022) to 2,977 (2024) — about 5.5× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~3,076 (extrapolated at 1.6%/yr trend). Census Bureau Vintage estimate: 3,211.
| Census data vintage | 2024 |
|---|---|
| County Population | 37,870 people |
| Annual growth rate · Population change | 3.3% |
| Annual growth rate · Population (2022) | 2,882 |
| Annual growth rate · Population (2024) | 2,977 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 2,977 people (vs Indiana 51,043) |
| Population Estimate | 3,211 |
Sources: U.S. Census Bureau, ACS 5-Year · U.S. Census Bureau, ACS 5-Year DP05 · U.S. Census Bureau, Vintage Population Estimates · Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 28.1y is 10.8 years younger than the U.S. median (38.9y). Children under 18 make up 27% — above the U.S. share of ~22%.
| Age Summary · Median age | 28.1 years (vs Indiana 36.0y) |
|---|---|
| Age Summary · Children Pct | 26.7% |
| Age Summary · Character | young community |
| Age Summary · Total Pop | 2,977 |
| Age Summary · Under 18 | 795 |
| Age Summary · 18 To 34 | 1,013 |
| Age Summary · 35 To 64 | 843 |
| Age Summary · 65 Plus | 326 |
| Median age | 28.1 years (vs Indiana 36.0y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 2,977 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.23 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| Diversity Index · Diversity index (Simpson) | 23.5% |
|---|---|
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 87.0% |
| Black population | 5.6% (vs Indiana 8.1%) |
| Hispanic or Latino population | 7.8% (vs Indiana 8.9%) |
| White (non-Hispanic) population | 72.9% (vs Indiana 74.1%) |
Sources: U.S. Census Bureau, ACS 5-Year DP05 · 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)
Sources: Census ACS 2022 B04006+B03001+B02001
Households & Family Composition
976 households. Averaging 3.1 people each — larger than the U.S. average of 2.5. 71% are family households — above the U.S. share of ~65%. Of 612 families, 27% are married couples with children.
| Family households | 691 households (vs Indiana 11,890) |
|---|---|
| Households that are families | 70.8% (vs Indiana 57.7%) |
| Total households | 976 households (vs Indiana 21,552) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 27.4% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Migration · People moving in (annual) | 35,433 |
|---|---|
| Migration · People moving out (annual) | 35,412 |
| Migration · Net migration (in − out) | 21 |
| Migration · Population growing | Yes |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Other
| County Cdc Birth Rate · Fips | 18017 |
|---|---|
| County Cdc Birth Rate · State Fips | 18 |
| County Cdc Birth Rate · County Fips | 017 |
| County Cdc Birth Rate · County | Cass |
| County Cdc Birth Rate · Birth Rate | 31.1 per 1,000 |
| County Cdc Birth Rate · Lower Ci | 26.50 |
| County Cdc Birth Rate · Upper Ci | 36.20 |
| County Cdc Mortality · Fips | 18017 |
| County Cdc Mortality · County | Cass County |
| County Cdc Mortality · Urban Rural | Micropolitan |
| County Cdc Mortality · Total Deaths 2020 2023 | 1,243 |
Sources: CDC NCHS Vital Statistics · CDC WONDER