![]() ![]() Major cities or places in Colorado within area code 303 include Denver, Aurora, Arvada, Westminster, Boulder, Longmont, Broomfield, Castle Rock, Commerce City, Parker and more. It was split in 1995 to form area code 970 and it was overlaid with area code 720. In 1988 it was split to form area code 719. It was one of the original codes created in North American Numbering Plan assigned in North-Central portion of the U.S. In 1947, area code 303 was officially put into service. What is area code 303 and where is it coming from? To get to know more with area code 303 we addressed these concerns with the questions below. There are area codes that are assigned in specific areas of United States and area code 303 is one of them. ![]() ![]() You will wonder why where does it originate from or if it is not associated with scammers. It is quite alarming when you get a call coming from a new area code. Denver, Aurora, Arvada, Westminster, Boulder, Longmont, Broomfield, Castle Rock, Commerce City, Parker
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