St. Lucas: Demographics & People
St. Lucas's population stands at 154 people, in 55 households. Population shrank 17.2% from 186 (2022) to 154 (2024). Median age 37.5 years. (6.4y younger than Fayette County; 1.3y younger than Iowa). Children under 18 are 32% of the population. Population is 100% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 76% of households are family-led. County is losing 199 residents per year (2022-2023). County health: 40% adult obesity, 20% smoke.
- 2.8 people per household.
- 24% non-family households (singles, roommates).
Population & Trend
Population shrank 17.2% from 186 (2022) to 154 (2024). Estimated 2026 population: ~128 (extrapolated at -8.6%/yr trend). Census Bureau Vintage estimate: 99.
| Census data vintage | 2024 |
|---|---|
| Population | 19,509 people |
| Annual growth rate · Population change | -17.2% |
| Annual growth rate · Population (2022) | 186 |
| Annual growth rate · Population (2024) | 154 |
| Annual growth rate · Trend category | shrinking |
| Population | 154 people |
| Population Estimate | 99 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 37.5y is 1.4 years younger than the U.S. median (38.9y). Children under 18 make up 32% — above the U.S. share of ~22%.
| Age Summary · Median age | 37.5 years (vs Iowa 38.8y) |
|---|---|
| Age Summary · Children Pct | 31.8% |
| Age Summary · Character | family-oriented |
| Population under 18 | 49 |
| Median age | 37.5 years (vs Iowa 38.8y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 154 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.00 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 186 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| White (non-Hispanic) population | 100.0% |
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 (4)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 131 |
|---|---|
| Residents born in another state | 23 |
| Share born in this state | 85.1% |
| Share born in another state | 14.9% |
| Native-born U.S. citizens | 14.9% |
| Total foreign-born residents | 279 |
Households & Family Composition
55 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 76% are family households — above the U.S. share of ~65%. Of 46 families, 26% are married couples with children.
| Children under 18 | 67 |
|---|---|
| Total families | 46 |
| Married couples with children | 12 |
| Single-parent households | 1 |
| Average household size | 2.82 |
| Women who gave birth (past year) | 5.9% |
| Grandparents living with grandchildren | 241 |
| Grandparents responsible for grandchildren | 113 |
| Family households | 42 households |
| Households that are families | 76.4% |
| Total households | 55 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. 2.0% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 199 residents per year on net (IRS migration data).
| Moved within the county (past year) | 2.0% |
|---|---|
| Migration · People moving in (annual) | 17,021 |
| Migration · People moving out (annual) | 17,220 |
| Migration · Net migration (in − out) | -199 |
| 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 | 9 |
|---|---|
| Disability rate | 6.2% |
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | IA-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 19,065 |
| Cdc Birth Rate · State Fips | 19 |
| Cdc Birth Rate · County Fips | 65 |
| Cdc Birth Rate · County | Fayette |
| Cdc Birth Rate · Birth Rate | 18.2% |
| Cdc Birth Rate · Lower Ci | 14.00 |
| Cdc Birth Rate · Upper Ci | 23.40 |
| Cdc Mortality · Fips | 19,065 |
| Cdc Mortality · County | Fayette County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 733 |
| Cdc Vaccination · Fips | 19,065 |
| Cdc Vaccination · County | Fayette County |
| Cdc Vaccination · Dose1 Pop Pct | 59.6% |
| Cdc Vaccination · Series Complete Pct | 56.0% |
| Cdc Vaccination · Booster Pct | 63.2% |
| Cdc Vaccination · Population 2019 | 19,650 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 8.50 |
| Family Score · Schools | 15 |
| Family Score · Children Pct | 31.8% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 154, shrinking, family-oriented, affluent, blue collar |
| Town Summary · Population | 154 people |
| Town Summary · County | Fayette County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade