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Colorado's explosive growth in the second half of the 20th century, particularly in the Denver/Boulder area, made it a certainty that
Colorado would need another area code. An impending number shortage in the late 1980s meant this split could no longer be staved off. On March 5, 1988, southeastern
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In 2020, the North
American Numbering Plan Administrator estimated that the Denver metropolitan area would reach numbering exhaustion by 2023. Accordingly, the Colorado Public Utilities Commission approved on May 21, 2021 an additional area code for the all-services distributed overlay of NPA
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303/720. Area code 983 was activated on June 17, 2022. No central office codes in 983 were allowed to be installed before complete exhaustion of the previous area codes. This latest addition resulted in 23.8 million numbers being assigned to an area of about 3.5 million people.
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area is home not only to most of
Colorado's landlines, but also most of the state's cell phones, fax machines, and pagers. On September 1, 1998, area code 720 was instituted in the 303 service area to create an
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Although the 1995 split was intended as a long-term solution, the area continued to experience sharp growth so that within two years, further relief was necessary. The
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161:. This split reduced 303 to the Denver-Boulder area. With the 1995 split, 303 was the only Colorado area code that did not border another state.
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105:. Area code 303 is the original area code, while area codes 720 and 983 were added (in 1998 and 2022 respectively) to form an
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The numbering plan area is one of the largest toll-free calling zones in the western United States. With the exception of
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141:. Further demand for numbers led to another split: The northeastern and western portions of area code 303, including
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of 1947, and originally served the entire state of
Colorado. It remained the state's sole area code for 40 years.
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197:, no long-distance charges are levied for any calls made from one telephone to another in the area.
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for the area, meaning that the same geographic service area is served by all area codes and that
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Clickable map of
Colorado area codes in blue (with bordering states).
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is required for all calls made within the service area.
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NPA 983 and 303/720 All-Services
Overlay (Colorado)
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81:, as well as their surrounding suburbs, including
536:Telecommunications-related introductions in 1998
531:Telecommunications-related introductions in 1947
212:List of North American Numbering Plan area codes
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157:, were separated on April 2, 1995, and became
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344:"Denver's new area code starts in 2022"
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333:, Planning Letter PL-563 (2021-07-29)
65:for the north-central portion of the
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302:2020-1 NRUF and NPA Exhaust Analysis
73:. The numbering plan area comprises
279:"10-Digit Dialing Hits Denver Area"
277:MICHAEL LOVELL (August 31, 1998).
265:NANPA Information Letter 94/09-012
255:(1987-03-27), retrieved 2020-08-29
123:original North American area codes
25:
365:"Colorado Counties by Population"
267:(1994-09-21) retrieved 2020-08-29
253:NANP Information Letter 87-03-045
546:Area codes in the United States
1:
408:Localcallingguide.com NPA 720
403:Localcallingguide.com NPA 303
121:Area code 303 was one of the
63:North American Numbering Plan
27:Colorado telephone area codes
207:List of Colorado area codes
55:Area codes 303, 720 and 983
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232:"Area Codes Map, Colorado"
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556:Denver metropolitan area
541:Area codes in Colorado
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379:"Local Calling Guide"
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129:Colorado, including
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551:Boulder, Colorado
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111:ten-digit dialing
16:(Redirected from
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131:Colorado Springs
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107:overlay complex
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397:External links
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147:Grand Junction
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57:are telephone
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181:Local calling
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159:area code 970
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139:area code 719
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18:Area code 303
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417:area codes:
382:. Retrieved
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347:. Retrieved
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309:, retrieved
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283:. Retrieved
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236:. Retrieved
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143:Fort Collins
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458:303/720/983
419:303/720/983
166:Front Range
103:Castle Rock
525:Categories
507:40°N 105°W
218:References
95:Broomfield
67:U.S. state
59:area codes
281:. Reuters
238:April 24,
87:Littleton
512:40; -105
415:Colorado
285:June 10,
201:See also
191:Brighton
91:Longmont
83:Lakewood
71:Colorado
349:May 27,
327:NANPA,
234:. NANPA
195:Wiggins
171:overlay
117:History
79:Boulder
61:in the
311:May 9,
193:, and
187:Roggen
135:Pueblo
101:, and
99:Aurora
75:Denver
498:105°W
476:South
436:North
306:(PDF)
155:Aspen
495:40°N
463:East
449:West
386:2012
351:2021
313:2021
287:2019
240:2018
153:and
151:Vail
133:and
77:and
480:719
467:719
453:970
440:970
427:970
423:719
173:.
97:,
69:of
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320:^
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93:,
89:,
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388:.
367:.
353:.
289:.
242:.
20:)
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