List of future North American area codes explained

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] [2]	Effective date
257	236/672/778, 604, 250	British Columbia	2025 – 4th Qtr[3]	[4] [5]
357	559	California	2025 – 3rd Qtr	[6]
457	318	Louisiana	2026 – 1st Qtr	[7]
460	705/249/683	Ontario	2032 – 2nd Qtr	TBD
471	662	Mississippi	2026 – 3rd Qtr	TBD
483	334	Alabama	2026 – 3rd Qtr	[8] [9]
537	905/289/365/742	Ontario	2029 – 2nd Qtr	TBD
568	368/403/587/780/825	Alberta	2028 – 1st Qtr	TBD
621			2025 – 3rd Qtr	[10] [11]
679	313	Michigan	2027 – 2nd Qtr	[12] [13]
729	423	Tennessee	2025 – 3rd Qtr	[14] [15]
738	213/323	California	2026 – 2nd Qtr	[16] [17]
748	970	Colorado	2026 – 1st Qtr	[18] [19]
821	864	South Carolina	2024 – 3rd Qtr	[20]
837	530	California	2025 - 3rd Qtr[21]	[22]
851	902/782	Nova Scotia	2029 – 2nd Qtr	TBD
924	507	Minnesota	2025 – 1st Qtr	[23] [24]
942	416/647/437	Ontario	2025 – 4th Qtr	[25]
NPA boundary changes, overlay expansions, etc.
			2026 – 1st Qtr	[26]

Other area codes that are expected to exhaust by the end of 2027 that do not have an approved relief plan: 352, 502, 520, 603, 714/657, 718/347/929, 765 and 949.^[27]

See also

• List of North American Numbering Plan area codes

External links

• NANPA Area Code Relief Planning
• Canadian Numbering Administrator (CNA) website
• Canadian Steering Committee on Numbering (CSCN)

Notes and References

1. Web site: NPAs Exhausting in the Next 36 Months. NANPA. 10 April 2015. .xlsx. 2015-04-10.
2. Web site: Planned NPAs Not Yet in Service . North American Numbering Plan Administrator (NANPA) . 16 July 2024 . .do . live.
3. Web site: Telecom Decision CRTC 2022-308 . Government of Canada – CRTC Archives . Canadian Radio-television and Telecommunications Commission (CRTC) . 16 July 2024 . 8 November 2024 . live.
4. Web site: Telecom Decision CRTC 2023-135 . Government of Canada – CRTC Archives . Canadian Radio-television and Telecommunications Commission (CRTC) . 16 July 2024 . 10 May 2023 . live.
5. Web site: NANPA Planning Letter 612 – NPA 257 to Overlay NPA 236/250/604/672/778 . NANPA . .pdf . 16 July 2024 . 11 May 2023 . live.
6. Web site: NANPA Planning Letter 624 – NPA 357 to Overlay NPA 559 (California) . NANPA . 16 July 2024 . 6 Feb 2024 . live.
7. Web site: NANPA Planning Letter 617 – NPA 457 to Overlay NPA 318 (Louisiana) . NANPA . 16 July 2024 . 23 June 2023 . live.
8. Web site: NANPA Planning Letter 626 – NPA 483 to Overlay NPA 334 (Alabama) . NANPA . 16 July 2024 . 7 May 2024 . live.
9. Web site: Area Code 483 - Details, official location, official service date, history and time zone .
10. Web site: NANPA Planning Letter 623 – NPA 621 to Overlay NPA 281/346/713/832 (Texas) . NANPA . 16 July 2024 . 6 December 2023 . live.
11. Web site: Area Code 621 - Details, official location, official service date, history and time zone .
12. Web site: NANPA Planning Letter 618 – NPA 679 to Overlay NPA 313 (Michigan) . NANPA . 16 July 2024 . 13 July 2023 . live.
13. Web site: Area Code 679 - Details, official location, official service date, history and time zone . 2023-11-07 . www.areacodehelp.com . en.
14. Web site: NANPA Planning Letter 619 – NPA 729 to Overlay NPA 423 (Tennessee) . NANPA . 16 July 2024 . 24 July 2023 . live.
15. Web site: Area Code 729 - Details, official location, official service date, history and time zone . 2023-11-07 . www.areacodehelp.com . en.
16. Web site: NANPA Planning Letter 614 – NPA 738 to Overlay NPA 213/323 (California) . NANPA . 16 July 2024 . 16 May 2023 . live.
17. Web site: Area Code 738 - Details, official location, official service date, history and time zone . 2023-11-07 . www.areacodehelp.com . en.
18. Web site: NANPA Planning Letter 625 – NPA 748 to Overlay NPA 970 (Colorado) . NANPA . 16 July 2024 . 13 February 2024 . live.
19. Web site: Area Code 748 - Details, official location, official service date, history and time zone .
20. Web site: Planning Letter PL-606, NPA 821 and 864 All-Services Overlay (South Carolina). NANPA. 2022-11-28. 2022-12-02.
21. Web site: CPUC Provides More Numbers for 530 Area Code .
22. Web site: NANPA Planning Letter 621 – NPA 837 and 530 All-Services Overlay (California) . NANPA . 16 July 2024 . .pdf . 8 August 2023 . live.
23. Web site: NANPA Planning Letter 616 – NPA 924 to Overlay NPA 507 (Minnesota) . NANPA . 16 July 2024 . 12 June 2023 . live.
24. Web site: Area Code 924 - Official Usage, Details, Location, History . 2023-11-07 . www.areacodehelp.com . en.
25. Web site: NANPA Planning Letter 613 – NPA 942 to Overlay NPA 416/437/647 (Toronto, Ontario) . NANPA . 16 July 2024 . 11 May 2023 . live.
26. Web site: NANPA Planning Letter 620 – NPA 564 to Overlay NPA 206 (Washington) . NANPA . 16 July 2024 . 3 August 2023 . live.
27. Web site: 2024-1 NRUF and NPA Exhaust Analysis . NANPA . 16 July 2024.