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U.S. Area Codes by State: Colorado (720)

  Area Codes for Colorado: 303, 719, 720, 970

720

Arvada, Aurora, Bailey, Boulder, Brighton, Broomfield, Castle Rock, Deer Trail, Denver, Englewood, Erie, Evergreen, Ft Lupton, Golden, Idaho Springs, Lafayette, Lakewood, Littleton, Longmont, Lookout Mountain, Lyons, Montbello, Morrison, Nederland, Parker, Sullivan

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