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 2026 population of 13,277. Eureka is currently growing at a rate of 1.07% annually and its population has increased by 12.75% since the most recent census, which recorded a population of 11,776 in 2020.

13.3K
Total Population
1,192
Density (mi²)
141 1.07%
Growth

Nearby Cities

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)