Eldorado Springs is an unincorporated community, a census-designated place and a post office located in and governed by Boulder County, Colorado, United States. The CDP is a part of the Boulder, CO Metropolitan Statistical Area. The Eldorado Springs post office has the ZIP code 80025. At the 2020 United States census, the population of the Eldorado Springs CDP was 559. Eldorado Canyon State Park, adjacent and upstream, is famous for its classic North-American climbing routes.