Eureka Flag

Eureka

County Seat:
No
Area (mi²):
11.14
State:
Missouri

Eureka is a city located in St. Louis County, Missouri. Eureka has a 2025 population of 13,974. Eureka is currently growing at a rate of 3.26% annually and its population has increased by 18.74% since the most recent census, which recorded a population of 11,769 in 2020.

The average household income in Eureka is $136,584 with a poverty rate of 6.16%.The median age in Eureka is 37.5 years: 36.3 years for males, and 38.9 years for females.

14K
Total Population
1,254
Density (mi²)
441 3.26%
Growth

Eureka Population

Demographics

Economics and Income Statistics

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)