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is a Statutory City that is the county seat of, and the only incorporated municipality in, Lake County, Colorado, United States. Situated at an elevation of 10,152 feet (3094 m), Leadville is the highest incorporated city and the second highest incorporated municipality in the United States. A former silver mining camp that lies near the headwaters of the Arkansas River in the heart of the Rocky Mountains, the city includes the Leadville Historic District, which preserves many historic structures and sites from Leadville's dynamic mining era.
In the late 1800s, Leadville was the second most populous city in Colorado, after Denver. The United States Census Bureau estimates that the city population has shrunk to only 2,688 in 2005.
Leadville is the highest incorporated city in the United States. Higher towns and unincorporated settlements do exist. See Extreme points of the United States.
At an elevation of 9,927 feet (3026 m) the Leadville Airport (Lake County Airport, KLXV) is the highest airport in the United States. At , the Mount Massive Golf Course is the second highest golf course in the United States.
According to the United States Census Bureau, the city has a total area of 1.1 square miles (2.7 km²), all of it land.