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Highlands Ranch, CO is currently using two area codes 303 and 720. Highlands Ranch, CO utilizes an area code overlay in
which area codes 303 and 720 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary in Highlands Ranch because two different homes in the same geographic area can
have the same seven digit phone number but each would have a different area code. The area code overlay which is in use in Highlands Ranch, CO today was established in 1998.
Area Code 303 which is
still in use in Highlands Ranch, CO was one of the original area codes established in 1947. At that time it covered the entire state of Colorado. The area code has been split numerous times. Today, in
addition to Highlands Ranch, CO, area codes 303 and 720 serve the larger communities of Arvada, Aurora, Boulder, Brighton, Broomfield, Castle Rock, Castlewood, Columbine, Commerce City, Denver, Englewood,
Ken Caryl, Lafayette, Lakewood, Littleton, Longmont, Loveland, Northglenn, Parker, Southglenn, Thornton, Westminster and Wheat Ridge. |
