Where in North America is area code 720?
Area codes 303 and 720 are telephone area codes in the North American Numbering Plan for the north-central portion of the 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-digi
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