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2. List of Colorado area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Colorado_area_codes

   Area code 303 is the original area code assigned to the entire state when the first nationwide telephone numbering plan was created in 1947. Today it only serves the greater Denver Metropolitan Area. Area codes 720 and 983 are overlay codes for today's 303 numbering plan area (NPA). Area code 719 serves Colorado Springs and southeastern Colorado.

3. List of North American Numbering Plan area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_North_American...

   2023: returned to the pool of area codes available for future area code relief; 457: Louisiana (Shreveport–Bossier City, Monroe, Alexandria, Fisher, Tallulah, and most of northern Louisiana) September 25, 2025 [3] to be overlaid on 318; previously a fictitious area code assigned to identify Naked DSL/Dry Loop and dedicated data lines in ...

4. Centennial, Colorado - Wikipedia

   en.wikipedia.org/wiki/Centennial,_Colorado

   Centennial is a home rule municipality located in Arapahoe County, Colorado, United States. [1] The city population was 108,418 at the 2020 United States Census, making Centennial the 11th most populous municipality in Colorado. [3] Centennial is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and the Front Range ...

5. Area codes 303, 720, and 983 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_303,_720,_and_983

   The northeastern and western portions of area code 303, including Fort Collins, Grand Junction, Vail and Aspen, were separated on April 2, 1995, and became area code 970. This split reduced 303 to the Denver-Boulder area. [3] With the 1995 split, 303 was the only Colorado area code that did not border another state.

6. Denver metropolitan area - Wikipedia

   en.wikipedia.org/wiki/Denver_metropolitan_area

   The Denver–Aurora–Lakewood, CO Metropolitan Statistical Area; County 2010 Census 2020 Census Change City and County of Denver: 600,158 715,522

7. Area codes 717 and 223 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_717_and_223

   Area codes 717 and 223 are telephone area codes in the North American Numbering Plan (NANP) for South Central Pennsylvania and the Susquehanna Valley. The numbering plan area (NPA) includes the Harrisburg , Lancaster , and York metropolitan areas and a considerable portion of Pennsylvania Dutch Country , an area with nearly two million people.

8. North Central Colorado Urban Area - Wikipedia

   en.wikipedia.org/wiki/North_Central_Colorado...

   The North Central Colorado Urban Area [1] Core-based statistical area 2010 Census County 2010 Census 2000 Census Pop Change Denver–Aurora–Broomfield, CO MSA: 2,543,482 City and County of Denver, Colorado: 600,158 554,636 +8.21%: Arapahoe County, Colorado: 572,003 487,967 +17.22%: Jefferson County, Colorado: 534,543 527,056 +1.42%: Adams ...

9. Area codes 215, 267, and 445 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_215,_267,_and_445

   However, three central office codes were moved from 215 to east-central Pennsylvania's 717, namely 267 in Denver, 484 in Adamstown and 445 in Terre Hill, with 215-267 becoming 717-336 because 717-267 was already in use. These exchanges were originally slated to move into 610, but were served by non-Bell telephone companies which sought to ...