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US area codes

Oklahoma area codes

A checked list of 5 in-service geographic area codes in Oklahoma, with their dates, overlay partners and dialing rules.

Last checked 14 October 2026

Area codes across North America

Codes in service in Oklahoma

Oklahoma has 5 geographic area codes in service: 405, 539, 572, 580, 918. 405 is the oldest, dated 1947, and 572 the newest, dated 24 May 2021.1 All of Oklahoma's codes are on Central time.

Area codeNANPA locationNPA in-service dateIn-service overlay peersTime zoneLocal calls within the code
405OK1947572Central10 digits
539OK1 Apr 2011918Central10 digits
572OK24 May 2021405Central10 digits
580OK1 Nov 1997None listedCentral7 digits
918OK1953539Central10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Oklahoma

  • Before 1960: 405 (1947), 918 (1953)
  • 1990s: 580 (1 Nov 1997)
  • 2010s: 539 (1 Apr 2011)
  • 2020s: 572 (24 May 2021)

Oklahoma's in-service overlay groups are 405/572; 539/918.1

  • 405/572: 405 (1947) was joined by 572 on 24 May 2021.
  • 539/918: 918 (1953) was joined by 539 on 1 Apr 2011.

Dialing in Oklahoma

Local calls within a single area code in Oklahoma differ: 7 digits for 580; 10 digits for 405, 539, 572, 918. In Oklahoma, local calls to other area codes differ: 7 digits for 580; 10 digits for 405, 539, 572, 918.1 Seven-digit local dialing is still recorded for 580.

Pending codes in Oklahoma

NANPA marks relief planning as in progress for 580.

Neighbours of Oklahoma

Regions that border Oklahoma:

  • Arkansas: 4 codes (327, 479, 501, 870)
  • Colorado: 6 codes (303, 719, 720, 748, ...)
  • Kansas: 4 codes (316, 620, 785, 913)
  • Texas: 29 codes (210, 214, 254, 281, ...)

Rules that apply to every region are on the area-code reference.

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Further reading

Longer research pieces on this topic, each with its own source list and a downloadable PDF.

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What Phone Number to Use on Google Business Profile
A 2026 U.S. guide to choosing a Google Business Profile primary number, evaluating tracking versus a stable main line, checking account ownership, and testing calls before and after an edit.

Articles on this topic

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How to Check Phone Number History for a New Business
Learn how to check phone number history in 2026 before publishing a new business number: verify public listings, test calls, compare provider remedies and decide whether to accept or replace it.
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Business Call Forwarding to Cell Phone: Caller ID and Voicemail
A 2026 test guide for business calls forwarded to staff mobiles: identify the incoming number, prevent personal voicemail pickup, verify callbacks, and compare routing options.

Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

  1. NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
    https://reports.nanpa.com/public/npa_report.csv

Keep reading

Reference
How overlays work
Why two codes can serve the same area and what ten-digit dialling changes.
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