A place of residence to close to 21,384 citizens, Lone Tree is located in Douglas County and in the state of Colorado. The motorists of Lone Tree, CO pull in nearly $107,244 per calendar year and have close to 2.5 household members living at each address. The median cost of car insurance in Lone Tree, CO is approximately $90--a difference of $7 in contrast to the rate of car insurance in Colorado. Car drivers in Lone Tree can count on paying up to $242 per month and at the least $32 for car insurance.