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Area Code 303 is located in CO.
Cities located in 303 area code are Denver, Denver, Denver, Aurora, Golden, Brighton, Denver, Aurora, Aurora, Fort Lupton, Littleton, Henderson, Longmont, Hudson, Westminster, Louisville, Aurora, Idaho Springs, Charlotte, Strasburg, Bennett, Sedalia, Englewood, Keenesburg, Allenspark, Deer Trail, Byers, Lyons, Roggen.
Counties located in this area code are Arapahoe County, Jefferson County, Denver County, Adams County, Weld County, Douglas County, Boulder County, Clear Creek County, Mecklenburg County