St. Joe: Demographics & People
St. Joe's population stands at 411 people, in 144 households. Population shrank 2.1% from 420 (2022) to 411 (2024). Median age 33.6 years. (4.8y younger than DeKalb County; 4.6y younger than Indiana). Children under 18 are 28% of the population. Population is 95% White (non-Hispanic) and 3% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.06). 71% of households are family-led. County is gaining 304 residents per year (2022-2023). County health: 38% adult obesity, 18% smoke.
- 2.9 people per household.
- 29% non-family households (singles, roommates).
Population & Trend
Population shrank 2.1% from 420 (2022) to 411 (2024). Estimated 2026 population: ~402 (extrapolated at -1.1%/yr trend). Census Bureau Vintage estimate: 390.
| Census data vintage | 2024 |
|---|---|
| Population | 43,265 people |
| Annual growth rate · Population change | -2.1% |
| Annual growth rate · Population (2022) | 420 |
| Annual growth rate · Population (2024) | 411 |
| Annual growth rate · Trend category | declining |
| Population | 411 people |
| Population Estimate | 390 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 33.6y is 5.3 years younger than the U.S. median (38.9y). Children under 18 make up 28% — above the U.S. share of ~22%.
| Age Summary · Median age | 33.6 years (vs Indiana 38.2y) |
|---|---|
| Age Summary · Children Pct | 28.2% |
| Age Summary · Character | young professional |
| Population under 18 | 116 |
| Median age | 33.6 years (vs Indiana 38.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 411 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 | 405 |
|---|---|
| Hispanic or Latino residents | 12 |
| Diversity Index · Diversity index (Simpson) | 5.6% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 97.1% |
| Hispanic or Latino population | 3.4% |
| White (non-Hispanic) population | 94.9% |
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 (7)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 332 |
|---|---|
| Residents born in another state | 74 |
| Share born in this state | 80.8% |
| Share born in another state | 19.2% |
| Native-born U.S. citizens | 18.0% |
| Naturalized citizens | 1.2% |
| Total foreign-born residents | 15 |
Households & Family Composition
144 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 71% are family households — above the U.S. share of ~65%. Of 104 families, 25% are married couples with children.
| Children under 18 | 113 |
|---|---|
| Total families | 104 |
| Married couples with children | 26 |
| Single-parent households | 4 |
| Average household size | 2.86 |
| Women who gave birth (past year) | 38.6% |
| Grandparents living with grandchildren | 820 |
| Grandparents responsible for grandchildren | 350 |
| Family households | 102 households |
| Households that are families | 70.8% |
| Total households | 144 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. 6.6% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 304 residents per year on net (IRS migration data).
| Moved within the county (past year) | 6.6% |
|---|---|
| Migration · People moving in (annual) | 44,022 |
| Migration · People moving out (annual) | 43,718 |
| Migration · Net migration (in − out) | 304 |
| 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 | 35 |
|---|---|
| Disability rate | 8.2% |
Other
| Congressional District · District | 3 |
|---|---|
| Congressional District · Formatted | IN-03 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 18,033 |
| Cdc Birth Rate · State Fips | 18 |
| Cdc Birth Rate · County Fips | 33 |
| Cdc Birth Rate · County | De Kalb |
| Cdc Birth Rate · Birth Rate | 24.8% |
| Cdc Birth Rate · Lower Ci | 21.00 |
| Cdc Birth Rate · Upper Ci | 29.00 |
| Cdc Mortality · Fips | 18,033 |
| Cdc Mortality · County | DeKalb County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 1,388 |
| Cdc Vaccination · Fips | 18,033 |
| Cdc Vaccination · County | DeKalb County |
| Cdc Vaccination · Dose1 Pop Pct | 48.0% |
| Cdc Vaccination · Series Complete Pct | 44.1% |
| Cdc Vaccination · Booster Pct | 49.8% |
| Cdc Vaccination · Population 2019 | 43,475 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 7.50 |
| Family Score · Schools | 13 |
| Family Score · Children Pct | 28.2% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 411, declining, young professional, middle-class, blue collar |
| Town Summary · Population | 411 people |
| Town Summary · County | DeKalb County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade