Lone Tree is a home rule municipality in Douglas County, Colorado, United States. The city population was 10,218 at the 2010 United States Census, with an estimated population of 14,653 in 2018. Lone Tree is a part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area.
Lone Tree is located on the northern border of Douglas County, directly adjacent to Arapahoe County. It is in what is called the “South Metro” area of Denver, located 18 miles (29 km) south of Denver’s downtown.
The city annexed the University of Colorado South Denver campus, the former site of The Wildlife Experience, in 2017.
According to the United States Census Bureau, the city has a total area of 9.6 square miles (24.8 km), all of it land.
As of the census of 2000, there were 4,873 people, 1,848 households, and 1,367 families residing in the city. The population density was 2,827.2 people per square mile (1,093.9/km²). There were 1,906 housing units at an average density of 1,105.8 per square mile (427.9/km²). The racial makeup of the city was 91.55% White, 1.48% African American, 0.25% Native American, 3.69% Asian, 0.04% Pacific Islander, 1.31% from other races, and 1.68% from two or more races. Hispanic or Latino of any race were 4.58% of the population.
There were 1,848 households out of which 38.7% had children under the age of 18 living with them, 67.0% were married couples living together, 4.9% had a female householder with no husband present, and 26.0% were non-families. 19.5% of all households were made up of individuals and 1.7% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.08.
In the city, the population was spread out with 28.3% under the age of 18, 5.4% from 18 to 24, 34.5% from 25 to 44, 28.0% from 45 to 64, and 3.9% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 98.4 males. For every 100 females age 18 and over, there were 94.7 males.
The median income for a household in the city was $96,308, and the median income for a family was $109,003. Males had a median income of $90,690 versus $43,125 for females. The per capita income for the city was $46,287. About 1.2% of families and 1.4% of the population were below the poverty line, including 1.5% of those under age 18 and 3.7% of those age 65 or over.
In 2014, the population of Lone Tree, Colorado was 12,779 people. Lone Tree is part of one of the fastest growing areas in Colorado, being in Douglas County and South Metro Denver.