Eureka: Demographics & People
About 13,081 people live in Eureka, in 4,690 households. Population grew 5.7% from 12,371 (2022) to 13,081 (2024). Median age 37.5 years. (2.8y younger than St. Louis County). Children under 18 are 30% of the population. Population is 86% White (non-Hispanic) and 3% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.10). 68% of households are family-led. County is gaining 4,026 residents per year (2022-2023). County health: 39% adult obesity, 20% smoke.
- 2.8 people per household (vs Missouri avg 2.4).
- 32% non-family households (singles, roommates) (vs Missouri 42%).
- 78 dependents per 100 working-age (youth + seniors / 18-64) (vs Missouri 67).
Population & Trend
Population grew 5.7% from 12,371 (2022) to 13,081 (2024) — about 9.6× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~13,842 (extrapolated at 2.9%/yr trend). Census Bureau Vintage estimate: 14,900.
| Census data vintage | 2024 |
|---|---|
| Population | 226,739 people |
| Annual growth rate · Population change | 5.7% |
| Annual growth rate · Population (2022) | 12,371 |
| Annual growth rate · Population (2024) | 13,081 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 13,081 people (vs Missouri 29,363) |
| Population Estimate | 14,900 |
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 30% — above the U.S. share of ~22%.
| Age Summary · Median age | 37.5 years (at Missouri median) |
|---|---|
| Age Summary · Children Pct | 30.3% |
| Age Summary · Character | family-oriented |
| Age Summary · Total Pop | 13,081 |
| Age Summary · Under 18 | 3,968 |
| Age Summary · 18 To 34 | 2,182.0× |
| Age Summary · 35 To 64 | 5,165.0× |
| Age Summary · 65 Plus | 1,766 |
| Population under 18 | 3,968 |
| Median age | 37.5 years (at Missouri median) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 13,081 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.10 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 10,824 |
|---|---|
| Black residents | 49 |
| Asian residents | 269 |
| Hispanic or Latino residents | 289 |
| Diversity Index · Diversity index (Simpson) | 10.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 94.7% |
| Asian population | 2.2% (vs Missouri 1.9%) |
| Black population | 0.8% (vs Missouri 6.6%) |
| Hispanic or Latino population | 3.0% (vs Missouri 5.3%) |
| White (non-Hispanic) population | 85.6% (vs Missouri 77.7%) |
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%. 5% have naturalized to U.S. citizenship.
| Residents born in this state | 8,845 |
|---|---|
| Residents born in another state | 3,561 |
| Share born in this state | 67.6% |
| Share born in another state | 32.4% |
| Native-born U.S. citizens | 27.2% |
| Foreign-born residents | 0.4% |
| Naturalized citizens | 4.8% |
| Total foreign-born residents | 397 |
| From Europe | 45 |
| From Africa | 186 |
Households & Family Composition
4,690 households. Averaging 2.8 people each — larger than the U.S. average of 2.5. 68% are family households — above the U.S. share of ~65%. Of 3,088 families, 51% are married couples with children.
| Children under 18 | 3,853 |
|---|---|
| Total families | 3,088 |
| Married couples with children | 1,574 |
| Single-parent households | 116 |
| Average household size | 2.77 |
| Women who gave birth (past year) | 17.0% |
| Grandparents living with grandchildren | 28 |
| Grandparents responsible for grandchildren | 28 |
| Family households | 3,167 households (vs Missouri 7,284) |
| Households that are families | 67.5% (vs Missouri 58.3%) |
| Total households | 4,690 households (vs Missouri 11,992) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 17.6% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 4,026 residents per year on net (IRS migration data).
| Moved within the county (past year) | 17.6% |
|---|---|
| Migration · People moving in (annual) | 217,443 |
| Migration · People moving out (annual) | 213,417 |
| Migration · Net migration (in − out) | 4,026 |
| 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 | 630 |
|---|---|
| Disability rate | 5.4% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 247 residents live in group quarters (1.9% of population).
| Living in group quarters | 247 |
|---|
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 29099 |
| Cdc Birth Rate · State Fips | 29 |
| Cdc Birth Rate · County Fips | 099 |
| Cdc Birth Rate · County | Jefferson |
| Cdc Birth Rate · Birth Rate | 16.1% |
| Cdc Birth Rate · Lower Ci | 14.60 |
| Cdc Birth Rate · Upper Ci | 17.70 |
| Cdc Mortality · Fips | 29099 |
| Cdc Mortality · County | Jefferson County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 6,162 |
| Cdc Vaccination · Fips | 29099 |
| Cdc Vaccination · County | Jefferson County |
| Cdc Vaccination · Dose1 Pop Pct | 53.5% |
| Cdc Vaccination · Series Complete Pct | 46.8% |
| Cdc Vaccination · Booster Pct | 52.2% |
| Cdc Vaccination · Population 2019 | 225,081 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 4.50 |
| Family Score · Schools | 4 |
| Family Score · Childcare Centers | 5 |
| Family Score · Children Pct | 30.3% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 13,081, booming, family-oriented, affluent, white collar |
| Town Summary · Population | 13,081 people (vs Missouri 29,363) |
| Town Summary · County | Jefferson County |
Sources: NCES school congressional district assignment · federal dataset cascade