List of future North American area codes

This is a list of future area codes in the North American Numbering Plan (NANP) that are in the planning stages for relief of central office code exhaustion in the given numbering plan areas (NPAs). The dates are subject to change during implementation as published in the official NANP Administrator Planning Letters.

New area code Affected NPA Jurisdiction Projected exhaust date[1] Effective date
257 236/672/778, 604, 250 British Columbia 2025 – 4th Qtr May 24, 2025
357 559 California 2025 – 3rd Qtr March 26, 2025
457 318 Louisiana 2026 – 1st Qtr September 25, 2025
483 334 Alabama 2026 – 3rd Qtr February 23, 2026[2]
621 713/281/832/346 Texas 2025 – 3rd Qtr January 23, 2025[3]
679 313 Michigan 2027 – 2nd Qtr November 7, 2025[4]
729 423 Tennessee 2025 – 3rd Qtr March 5, 2025[5]
738 213/323 California 2026 - 2nd Qtr November 1, 2024[6]
748 970 Colorado 2026 – 1st Qtr July 7, 2025[7]
821 864 South Carolina 2024 – 3rd Qtr August 19, 2024[8]
837 530 California 2025 - 3rd Qtr[9] January 31, 2025
924 507 Minnesota 2025 - 1st Qtr August 30, 2024[10]
942 416/647/437 Ontario 2025 – 4th Qtr April 26, 2025
NPA boundary changes, overlay expansions, etc.
564206 Washington2026 – 1st QtrApril 5, 2025[11]
Undetermined relief method and code
unassigned662Mississippi2026 – 3rd Qtr

"679 area code" redirects here. For the telephonic country code, see +679.

See also

References
  1. "NPAs Exhausting in the Next 36 Months" (.xlsx). NANPA. 2015-04-10. Retrieved 10 April 2015.
  2. "Area Code 483 - Details, official location, official service date, history and time zone".
  3. "Area Code 621 - Details, official location, official service date, history and time zone".
  4. "Area Code 679 - Details, official location, official service date, history and time zone". www.areacodehelp.com. Retrieved 2023-11-07.
  5. "Area Code 729 - Details, official location, official service date, history and time zone". www.areacodehelp.com. Retrieved 2023-11-07.
  6. "Area Code 738 - Details, official location, official service date, history and time zone". www.areacodehelp.com. Retrieved 2023-11-07.
  7. "Area Code 748 - Details, official location, official service date, history and time zone".
  8. "Planning Letter PL-606, NPA 821 and 864 All-Services Overlay (South Carolina)" (PDF). NANPA. 2022-11-28. Retrieved 2022-12-02.
  9. "CPUC Provides More Numbers for 530 Area Code".
  10. "Area Code 924 - Official Usage, Details, Location, History". www.areacodehelp.com. Retrieved 2023-11-07.
  11. https://nationalnanpa.com/planning_letters/PL-620.pdf
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