
Eureka
- County:
- Lincoln County
- County Seat:
- No
- Area (mi²):
- 1.326
- State:
- Montana
Eureka is a town located in Lincoln County, Montana. Eureka has a 2025 population of 1,629. Eureka is currently growing at a rate of 3.04% annually and its population has increased by 17.36% since the most recent census, which recorded a population of 1,388 in 2020.
The average household income in Eureka is $58,947 with a poverty rate of 29.35%. The median age in Eureka is 37.7 years: 41.6 years for males, and 35.3 years for females.