Highlands Ranch, Colorado Area Code
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 addition to Highlands Ranch, CO area code information read more about area codes 303 and 720 details and Colorado area codes.
Highlands Ranch, CO is located in Douglas County and observes the Mountain Time Zone. View our Times by Area Code tool.