City · Missouri
Eureka, Missouri
Eureka, city, mostly in St. Louis County (99.4% of its 2020 residents), with a part in Jefferson County, Missouri. Eureka had 13,422 residents on July 1, 2025 by the Census Bureau's estimate, up 14.7% since 2020; the 2020 Census counted 11,646 and the ACS 2020-2024 5-year estimates put it at 13,081 (±308). GEOID 2922834.
Residents, July 2025 estimate
13,422
Census Bureau estimate (no margin published)
2020 Census count: 11,646 · ACS 2020-2024: 13,081 ±308
Median household income
$108,394
±$6,090 (90% margin)
Missouri: $70,702
Median home value
$379,200
±$27,351 (90% margin)
Missouri: $230,300
Median gross rent
$1,252
±$339 (90% margin)
Missouri: $1,033
Where is Eureka and what county is it in?
Eureka is a city mostly in St. Louis County (99.4% of its 2020 residents), with a part in Jefferson County, Missouri. It covers 11.2 square miles of land, 1,044 residents per square mile in 2020.
Eureka is in the St. Louis, MO-IL metropolitan statistical area, which takes in 15 counties (Census Bureau delineation, July 2023).
| County | 2020 residents | Share |
|---|---|---|
| St. Louis County | 11,575 | 99.4% |
| Jefferson County | 71 | 0.6% |
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Eureka, and is it growing?
The Census Bureau estimates that 13,422 people lived in Eureka on July 1, 2025, up 14.7% since 2020, faster than Missouri (+1.9%). The 2020 Census counted 11,646 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 13,081 (±308).
| Measure | Eureka | St. Louis County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 13,081 ±308 | 995,569 | +2,415 |
| Households | 4,690 ±301 | 413,849 | +1,167 |
| Average household size | 2.74 ±0.18 | 2.36 | no clear change |
| Housing units | 4,805 ±323 | 446,192 | +949 |
Eureka's population since 2000
From 7,676 in 2000 to 13,422 in 2025: up 74.9%. The 2000, 2010 and 2020 figures are census counts, each for Eureka as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Eureka?
The median resident of Eureka is 37.5 years old; 30.3% are under 18 and 13.5% are 65 or older. The largest group is non-Hispanic white residents at 85.6%, then non-Hispanic residents of two or more races at 7.7%. 4.8% of residents were born outside the United States.
| Measure | Eureka | St. Louis County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 37.5 ±2.4 | 40.3 | no clear change |
| Under 18 years | 30.3% ±3.4 pts | 22.0% | – |
| 65 years and over | 13.5% ±2.7 pts | 19.1% | – |
| Male | 52.5% ±2.2 pts | 47.8% | – |
| Hispanic or Latino (any race) | 3.0% ±1.8 pts | 3.9% | – |
| White alone, not Hispanic | 85.6% ±5.1 pts | 61.4% | no clear change |
| Black or African American alone, not Hispanic | 0.8% ±0.6 pts | 24.0% | – |
| Asian alone, not Hispanic | 2.2% ±1.3 pts | 4.9% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0% ±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.3 pts | 0.0% | – |
| Two or more races, not Hispanic | 7.7% ±4.6 pts | 5.3% | – |
| Some other race alone, not Hispanic | 0.7% ±1.1 pts | 0.5% | – |
| Born outside the United States | 4.8% ±1.9 pts | 8.4% | no clear change |
| Speak a language other than English at home (age 5+) | 5.6% ±2.8 pts | 10.5% | – |
| Civilian veterans (age 18+) | 6.7% ±2.0 pts | 6.0% | – |
| With a disability | 6.5% ±1.9 pts | 12.1% | – |
| No health insurance coverage | 2.4% ±1.4 pts | 5.7% | – |
| High school graduate or higher (age 25+) | 96.6% ±1.4 pts | 94.5% | – |
| Bachelor's degree or higher (age 25+) | 52.5% ±6.1 pts | 47.4% | no clear change |
| Graduate or professional degree (age 25+) | 22.3% ±4.1 pts | 20.4% | – |
| Lived in the same house a year earlier | 82.4% ±5.4 pts | 88.2% | – |
| Moved from another state in the past year | 3.2% ±2.7 pts | 2.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Eureka earn?
Half of Eureka's 4,690 households earn less than $108,394 a year (±$6,090), against $82,936 in St. Louis County and $70,702 in Missouri. In 2015-2019 the median was $136,678 in 2024 dollars, so it fell by $28,284 after inflation. 7.9% of residents live below the poverty line.
| Measure | Eureka | St. Louis County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $108,394 ±$6,090 | $82,936 | −$28,284 |
| Mean household income | $135,296 ±$12,838 | $123,036 | – |
| Per capita income | $49,181 ±$4,978 | $51,977 | no clear change |
| People below the poverty line | 7.9% ±3.6 pts | 9.8% | – |
| Children under 18 below the poverty line | 8.5% ±7.1 pts | 13.5% | – |
| Households receiving SNAP | 3.2% ±2.2 pts | 8.0% | – |
| Households with a computer | 96.4% ±3.3 pts | 96.3% | – |
| Households with a broadband subscription | 95.5% ±3.1 pts | 93.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Eureka?
Owners occupy 79.3% of Eureka's occupied homes and renters 20.7%. The median owner-occupied home is valued at $379,200 by its owner (±$27,351). The median renter pays $1,252 a month including utilities, and 31.4% of renters pay 35% or more of their income on rent.
| Measure | Eureka | St. Louis County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $379,200 ±$27,351 | $276,800 | +$37,313 |
| Median gross rent | $1,252 ±$339 | $1,209 | no clear change |
| Renters paying 35% or more of income on rent | 31.4% ±15.6 pts | 39.5% | no clear change |
| Median monthly owner costs, with a mortgage | $2,230 ±$140 | $1,753 | – |
| Owner-occupied homes | 79.3% ±4.8 pts | 69.2% | no clear change |
| Renter-occupied homes | 20.7% ±4.8 pts | 30.8% | – |
| Housing units | 4,805 ±323 | 446,192 | +949 |
| Homeowner vacancy rate | 0.0% ±0.9 pts | 0.7% | – |
| Rental vacancy rate | 1.5% ±2.5 pts | 5.0% | – |
| Single-family detached homes | 81.6% ±3.9 pts | 72.0% | – |
| Mobile homes | 0.0% ±0.7 pts | 0.3% | – |
| Built 2020 or later | 9.6% ±3.6 pts | 0.7% | – |
| Built 2010 to 2019 | 18.3% ±4.1 pts | 3.5% | – |
| Built 1939 or earlier | 3.0% ±2.3 pts | 9.7% | – |
| Households with no vehicle | 5.9% ±4.3 pts | 6.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Eureka building?
Builders took permits for 29 new housing units in Eureka in 2025 (29 in single-family houses), 2.2 per 1,000 residents against 2.8 across Missouri.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Eureka work and get to work?
74.3% of Eureka's workers drive alone and 17.9% work from home. The average trip to work takes 27.0 minutes. The unemployment rate in 2020-2024 averaged 3.4%.
| Measure | Eureka | St. Louis County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 69.1% ±3.8 pts | 65.0% | – |
| Unemployment rate | 3.4% ±1.9 pts | 4.3% | no clear change |
| Drove alone to work | 74.3% ±5.7 pts | 71.3% | – |
| Carpooled | 7.3% ±3.3 pts | 6.4% | – |
| Public transportation | 0.0% ±0.6 pts | 1.4% | – |
| Walked | 0.0% ±0.4 pts | 1.4% | – |
| Worked from home | 17.9% ±4.4 pts | 18.3% | +10.1 pts |
| Mean travel time to work | 27.0 min ±1.6 | 23.1 min | −2.8 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Eureka?
1 census tract lies mostly in Eureka, and 2 more reach into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 2215.03St. Louis County | 7,630 | $111,593 |
| Tract 2215.02St. Louis County | 8,029 | $113,299 |
| Tract 7004.02Jefferson County | 7,198 | $133,854 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Eureka) · Census block assignment files
How does Eureka compare with other places in Missouri?
By the Census Bureau's July 2025 estimates, Eureka is the 2,605th-most populous of the 19,476 U.S. incorporated places that have one and the 62nd-most populous of 936 in Missouri.
Eureka ranks 36th of 416 places in Missouri with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 62nd | 936 |
| Growth 2020-2025 (PEP) | 20th | 394 |
| Residents per square mile | 212th | 420 |
| Median household income | 36th | 416 |
| Per capita income | 45th | 420 |
| Median home value | 29th | 416 |
| Median gross rent | 49th | 398 |
| Poverty rate | 304th | 373 |
| Bachelor's degree or higher | 37th | 404 |
| Median age | 245th | 420 |
| Owner-occupied share | 84th | 418 |
| Work from home | 58th | 270 |
| Travel time to work | 100th | 420 |
Eureka's figures with every place in Missouri (CSV)
Every place in Missouri, sortable · Compare Eureka with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Eureka?
14 of the 57 figures for Eureka on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Eureka are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Eureka.