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 was 2,688 in 2005.
As of the census of 2000, there were 2,821 people, 1,253 households, and 675 families residing in the city. The population density was 2,659.5 people per square mile (1,027.5/km²). There were 1,514 housing units at an average density of 1,427.3/sq mi (551.5/km²). The racial makeup of the city was 83.52% White, 0.14% African American, 1.28% Native American, 0.32% Asian, 0.11% Pacific Islander, 12.34% from other races, and 2.30% from two or more races. Hispanic or Latino of any race were 25.45% of the population.
There were 1,253 households out of which 24.7% had children under the age of 18 living with them, 40.7% were married couples living together, 8.5% had a female householder with no husband present, and 46.1% were non-families. 35.0% of all households were made up of individuals and 9.2% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 2.91.
In the city the population was spread out with 21.1% under the age of 18, 12.1% from 18 to 24, 34.4% from 25 to 44, 22.0% from 45 to 64, and 10.4% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 109.1 males. For every 100 females age 18 and over, there were 107.8 males.
The median income for a household in the city was $36,714, and the median income for a family was $44,444. Males had a median income of $28,125 versus $23,512 for females. The per capita income for the city was $20,607. About 9.1% of families and 13.3% of the population were below the poverty line, including 18.5% of those under age 18 and 7.5% of those age 65 or over.
Leadville is served by Lake County Airport. However, there are no scheduled airline services available from this airport. The closest airports to provide scheduled services are Eagle County Airport and Aspen-Pitkin County Airport, both located 62 miles (100 km) away.
All of the highways in Lake County are part of the Top of the Rockies Scenic and Historic Byway.