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

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

   A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).

3. List of area code overlays - Wikipedia

   en.wikipedia.org/wiki/List_of_area_code_overlays

   An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers .

4. Overlay complex - Wikipedia

   en.wikipedia.org/wiki/Overlay_complex

   In telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbering Plan (NANP) to mitigate exhaustion of central office codes in growth areas. The method has been in ...

5. Area codes 512 and 737 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_512_and_737

   Counties currently served by these area codes include Bastrop, Burnet, Caldwell, Hays, Travis, Milam and Williamson. Area code 512 was one of the original area codes established in October 1947. At that time it covered most of the south-central portion of Texas, from the Gulf of Mexico to the Mexican border. Besides Austin, it included San ...

6. List of Texas area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Texas_area_codes

   Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas. The date of establishment of each area code is indicated in parentheses: [1] 210: San Antonio area; overlays with 726 (November 1, 1992) 214: Dallas area, overlays with 469, 972, and 945 (October 1947)

7. Area codes 713, 281, 832, 346, and 621 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_713,_281,_832...

   On January 16, 1999, the 713/281 boundary was removed, creating an overlay for the combined area, while simultaneously adding a third area code to the entire region, 832. As a result, ten-digit dialing became required for all calls in the Houston area. On May 9, 2013, the Public Utility Commission of Texas (PUC) announced the addition of yet ...