St. Augustine: Demographics & People
St. Augustine is home to 92 people, in 63 households. Population shrank 25.2% from 123 (2022) to 92 (2024). Median age 60.3 years. (17.7y older than Knox County; 21.2y older than Illinois). Children under 18 are 5% of the population. Population is 99% White (non-Hispanic) and 1% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.06). 35% of households are family-led. County is losing 412 residents per year (2022-2023). County health: 39% adult obesity, 19% smoke.
- 1.5 people per household.
- 65% non-family households (singles, roommates).
Population & Trend
Population shrank 25.2% from 123 (2022) to 92 (2024). Estimated 2026 population: ~70 (extrapolated at -12.6%/yr trend). Census Bureau Vintage estimate: 46.
| Census data vintage | 2024 |
|---|---|
| Population | 49,967 people |
| Annual growth rate · Population change | -25.2% |
| Annual growth rate · Population (2022) | 123 |
| Annual growth rate · Population (2024) | 92 |
| Annual growth rate · Trend category | shrinking |
| Population | 92 people |
| Population Estimate | 46 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 60.3y is 21.4 years older than the U.S. median (38.9y). Children under 18 make up 5% — below the U.S. share of ~22%.
| Age Summary · Median age | 60.3 years (vs Illinois 39.1y) |
|---|---|
| Age Summary · Children Pct | 5.4% |
| Age Summary · Character | retirement community |
| Population under 18 | 5 |
| Median age | 60.3 years (vs Illinois 39.1y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 92 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 | 122 |
|---|---|
| Hispanic or Latino residents | 4 |
| Diversity Index · Diversity index (Simpson) | 6.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 96.8% |
| Hispanic or Latino population | 1.1% |
| White (non-Hispanic) population | 98.9% |
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).
| Residents born in this state | 85 |
|---|---|
| Residents born in another state | 6 |
| Share born in this state | 92.4% |
| Share born in another state | 7.6% |
| Native-born U.S. citizens | 6.5% |
| Naturalized citizens | 1.1% |
| Total foreign-born residents | 1 |
Households & Family Composition
63 households. Averaging 1.9 people each — smaller than the U.S. average of 2.5. 35% are family households — below the U.S. share of ~65%. Of 37 families, 5% are married couples with children.
| Children under 18 | 16 |
|---|---|
| Total families | 37 |
| Married couples with children | 2 |
| Average household size | 1.95 |
| Women who gave birth (past year) | 30.3% |
| Grandparents living with grandchildren | 5 |
| Family households | 22 households |
| Households that are families | 34.9% |
| Total households | 63 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. The surrounding county is losing 412 residents per year on net (IRS migration data).
| Lived in same home a year ago | 92.0% |
|---|---|
| Migration · People moving in (annual) | 40,878 |
| Migration · People moving out (annual) | 41,290 |
| Migration · Net migration (in − out) | -412 |
| 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 | 17 |
|---|---|
| Disability rate | 13.6% |
Other
| Congressional District · District | 17 |
|---|---|
| Congressional District · Formatted | IL-17 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 17,095 |
| Cdc Birth Rate · State Fips | 17 |
| Cdc Birth Rate · County Fips | 95 |
| Cdc Birth Rate · County | Knox |
| Cdc Birth Rate · Birth Rate | 21.3% |
| Cdc Birth Rate · Lower Ci | 18.10 |
| Cdc Birth Rate · Upper Ci | 24.90 |
| Cdc Mortality · Fips | 17,095 |
| Cdc Mortality · County | Knox County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 2,433 |
| Cdc Vaccination · Fips | 17,095 |
| Cdc Vaccination · County | Knox County |
| Cdc Vaccination · Dose1 Pop Pct | 65.5% |
| Cdc Vaccination · Series Complete Pct | 60.6% |
| Cdc Vaccination · Booster Pct | 58.6% |
| Cdc Vaccination · Population 2019 | 49,699 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 5.4% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 92, shrinking, retirement community, working-class, blue collar |
| Town Summary · Population | 92 people |
| Town Summary · County | Knox County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade