Northglenn, Colorado Area Code
Northglenn, 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 Northglenn, CO area code information read more about area codes 303 and 720 details and Colorado area codes.
Northglenn, CO is located in Adams and Weld County and observes the Mountain Time Zone. View our Times by Area Code tool.