There are 1 US Post Offices in Lake County serving a total of 7,090 residents equating to 7,090 residents per post office. It's estimated that approximately 11,316 packages are handled across the 1 county post offices annually. Lake County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 7,310. The county seat and the only municipality in the county is Leadville. The highest natural point in Colorado and the entire Rocky Mountains is the summit of Mount Elbert in Lake County at 14,440 feet (4401.2 meters) elevation.