Eureka city, Missouri
Official LSAD Designation: Eureka city • Census GEOID: 2922834
• Jefferson County / St. Louis County
Eureka city is an incorporated city in Jefferson County, St. Louis County, Missouri. According to official records from the Census (2025), Eureka city had an estimated population of 13,422 residents. Official Census Bureau geographic records classify this community under LSAD designation Eureka city (GEOID 2922834).
Local Government Administration U.S. Census Bureau GMAF
City Of Eureka
Municipal
Official Title:
Building Department Assistant
Address:
PO BOX 125, EUREKA MO 63025-0125
County Of Jefferson
County
Official Title:
County Executive
Address:
PO BOX 100, HILLSBORO MO 63050-0100
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 13,422 | 2025 |
| Median Household Income | $108,394 | 2020-2024 |
| Median Home Value | $379,200 | 2020-2024 |
| Land Area | 11.16 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).