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Area Code 303 History:
01/01/1947 Area code 303 was 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.
Counties in Colorado within area code 303 include:
Adams County, Arapahoe County, Boulder County, Broomfield County, Clear Creek
County, Denver County, Douglas County, Eagle County, El Paso County, Elbert County, Gilpin County, Jefferson County, Park County, Sedgwick County, and Weld County.
Places in Colorado within area
code 303 include:
Area code 303 serves Aurora, Boulder, Denver, Longmont and Westminster. |