- Eureka, California, the largest US city named Eureka
- Eureka, Nevada County, California
- Eureka, Colorado
- Eureka, Illinois
- Eureka College
- Eureka, Lawrence County, Indiana, an unincorporated community
- Eureka, Spencer County, Indiana, an unincorporated community
- Eureka, Kansas
- Eureka, Missouri
- Eureka, Perry County, Missouri
- Eureka, Montana
- Eureka, Nevada
- Eureka, North Carolina
- Eureka, Pennsylvania
- Eureka, South Dakota
- Eureka, Texas
- Eureka, Utah
- Eureka, Washington
- Eureka, West Virginia
- Eureka, Polk County, Wisconsin, a town
- Eureka, Winnebago County, Wisconsin, an unincorporated community
- Eureka Center, Minnesota
- Eureka Center, Wisconsin
- Eureka County, Nevada
- Eureka Springs, Arkansas
- Eureka Township, Adair County, Iowa
- Eureka Township, Michigan
- Eureka Township, Dakota County, Minnesota
- Eureka Township, Valley County, Nebraska
- Eureka Valley (Inyo County), California
- Eureka Valley, San Francisco, California
feb 24 2018 ∞
feb 24 2018 +
feb 24 2018 +