St. Libory: Demographics & People
St. Libory's population stands at 559 people, in 255 households. Population shrank 8.7% from 612 (2022) to 559 (2024). Median age 43.3 years. (3.4y older than St. Clair County; 4.2y older than Illinois). Children under 18 are 17% of the population. Population is 96% White (non-Hispanic) and 1% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.05). 66% of households are family-led. County is losing 2,121 residents per year (2022-2023). County health: 38% adult obesity, 16% smoke.
- 2.2 people per household.
- 34% non-family households (singles, roommates).
Population & Trend
Population shrank 8.7% from 612 (2022) to 559 (2024). Estimated 2026 population: ~511 (extrapolated at -4.3%/yr trend). Census Bureau Vintage estimate: 452.
| Census data vintage | 2024 |
|---|---|
| Population | 257,400 people |
| Annual growth rate · Population change | -8.7% |
| Annual growth rate · Population (2022) | 612 |
| Annual growth rate · Population (2024) | 559 |
| Annual growth rate · Trend category | shrinking |
| Population | 559 people |
| Population Estimate | 452 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 43.3y is 4.4 years older than the U.S. median (38.9y). Children under 18 make up 17% — below the U.S. share of ~22%.
| Age Summary · Median age | 43.3 years (vs Illinois 39.1y) |
|---|---|
| Age Summary · Children Pct | 17.0% |
| Age Summary · Character | established |
| Population under 18 | 95 |
| Median age | 43.3 years (vs Illinois 39.1y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 559 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.05 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 592 |
|---|---|
| Hispanic or Latino residents | 14 |
| Diversity Index · Diversity index (Simpson) | 4.5% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 2 |
| Diversity Index · Largest group share | 97.7% |
| Hispanic or Latino population | 1.3% |
| White (non-Hispanic) population | 95.5% |
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). 0.4% are foreign-born — below the U.S. average of 13.9%. 0% have naturalized to U.S. citizenship.
| Residents born in this state | 511 |
|---|---|
| Residents born in another state | 43 |
| Share born in this state | 91.4% |
| Share born in another state | 8.6% |
| Native-born U.S. citizens | 7.7% |
| Foreign-born residents | 0.4% |
| Naturalized citizens | 0.5% |
| Total foreign-born residents | 8,150 |
Households & Family Composition
255 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 66% are family households — near the U.S. share of ~65%. Of 190 families, 32% are married couples with children.
| Children under 18 | 121 |
|---|---|
| Total families | 190 |
| Married couples with children | 61 |
| Single-parent households | 9 |
| Average household size | 2.27 |
| Women who gave birth (past year) | 17.1% |
| Grandparents living with grandchildren | 5,013 |
| Grandparents responsible for grandchildren | 1,639 |
| Family households | 168 households |
| Households that are families | 65.9% |
| Total households | 255 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. 8.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 2,121 residents per year on net (IRS migration data).
| Moved within the county (past year) | 8.7% |
|---|---|
| Migration · People moving in (annual) | 229,470 |
| Migration · People moving out (annual) | 231,591 |
| Migration · Net migration (in − out) | -2,121 |
| 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 | 50 |
|---|---|
| Disability rate | 7.8% |
Other
| Congressional District · District | 12 |
|---|---|
| Congressional District · Formatted | IL-12 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 17,163 |
| Cdc Birth Rate · State Fips | 17 |
| Cdc Birth Rate · County Fips | 163 |
| Cdc Birth Rate · County | St Clair |
| Cdc Birth Rate · Birth Rate | 21.5% |
| Cdc Birth Rate · Lower Ci | 19.90 |
| Cdc Birth Rate · Upper Ci | 23.20 |
| Cdc Mortality · Fips | 17,163 |
| Cdc Mortality · County | St. Clair County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 9,349 |
| Cdc Vaccination · Fips | 17,163 |
| Cdc Vaccination · County | St. Clair County |
| Cdc Vaccination · Dose1 Pop Pct | 74.5% |
| Cdc Vaccination · Series Complete Pct | 65.8% |
| Cdc Vaccination · Booster Pct | 50.2% |
| Cdc Vaccination · Population 2019 | 259,686 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 17.0% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 559, shrinking, established, affluent, mixed |
| Town Summary · Population | 559 people |
| Town Summary · County | St. Clair County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade