Area codes 303, 720, and 983

The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock.

[2] This was intended as a long-term solution, but within five years further demand for numbers and the proliferation of cell phones and pagers (especially in and around Denver) forced another split.

The Front Range is home not only to most of Colorado's landlines, but also most of the state's cell phones, fax machines, and pagers.

[5] Accordingly, the Colorado Public Utilities Commission approved on May 21, 2021 an additional area code for the all-services distributed overlay of NPA 303/720.

[citation needed] With the exception of Roggen, Brighton, and Wiggins,[9][failed verification] no long-distance charges are levied for any calls made from one telephone to another in the area.

Area code 970 Area codes 303, 720, and 983 Area code 719 Area code 785 Area code 308 Area code 307 Area code 435 Area code 928 Area code 575 Area code 505 Area code 580 Area code 620
Clickable map of Colorado area codes in blue (with bordering states). [ 1 ]