Eureka is an unincorporated town and census-designated place in and the county seat of Eureka County, Nevada, United States. With a population of 414 as of the 2020 United States census, it is the second-largest community in Eureka County. Attractions include the Eureka Opera House, Raine’s Market and Wildlife Museum, the Jackson House Hotel, and the Eureka Sentinel Museum. Eureka is part of the Elko Micropolitan Statistical Area.