303 Area Code

303 Area Code

303 Area Code

Area codes 303 and 720 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Aurora, and Castle Rock. Area code 303 is the original area code, while area code 720 was added to form an overlay plan for the area, meaning that the same geographic service area is served by both area codes and that ten-digit dialing is required for all calls made within the service area. 

Former Denver Metro Communities Now Part of the Separate Boulder Metropolitan Area Due to Being Located in Boulder County

The Denver Regional Council of Governments (DRCOG, pronounced Doctor Cog) is a regional planning and inter-governmental coordination organization in a nine-county region. The Scientific and Cultural Facilities District (SCFD) provides funding for scientific and cultural facilities in a seven-county region 

Area Code 30

Area code 303 was officially put into service. In 1988 Area code 303 was split to form area code 719. In 1995 area code 303 was split to form area code 970. In 1998 area code 303 was overlaid with area code 720. (Source: www.areacodehelp.com)

Although the 1995 split was intended as a long-term solution, the area continued to experience sharp growth so that within two years, further relief was necessary. The Front Range is home not only to most of Colorado's landlines, but also most of the state's cell phones, fax machines, and pagers. On September 1, 1998, area code 720 was activated in the 303 service area to create an overlay. (Source: en.wikipedia.org)

Area code 983 has been approved as an all services overlay of area codes 303 and 720 with an implementation date of 6/17/2022. Area code 983 will not be put into service until area codes 303 and 720 have no remaining prefixes to be assigned. Ten digit dialing (area code + seven digit number) will be necessary in the 303/720/983 overlay because different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. (Source: www.areacodehelp.com)



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