Oklahoma has 5 active area codes serving cities and communities across the entire state in the Central Time Zone. Originally starting with just one area code in 1947, Oklahoma has grown to include multiple codes serving the Oklahoma City metro area, Tulsa region, and rural communities statewide.

Whether you need to identify an unknown caller, schedule business calls, or understand local dialing requirements, this guide provides complete and current information about every Oklahoma area code.

Oklahoma Area Codes & Time Zone Finder

Key Takeaways:

  • Oklahoma uses 5 area codes: 405, 539, 572, 580, and 918
  • The entire state operates in the Central Time Zone (CST/CDT, UTC-6)
  • 572 is the newest code, added in May 2021 as an overlay to 405
  • 918 serves the most people with approximately 1.5 million residents
  • All local calls require 10-digit dialing in overlay areas (405/572 and 918/539)
  • 405 was Oklahoma’s original area code, introduced in 1947

All Oklahoma Area Codes

Area CodePrimary Cities/RegionsTime ZoneTypeYear Introduced
405Oklahoma City, Norman, EdmondCentral (CST)Original1947
539Tulsa, Broken Arrow, MuskogeeCentral (CST)Overlay2011
572Oklahoma City, Norman, EdmondCentral (CST)Overlay2021
580Lawton, Enid, Ponca CityCentral (CST)Split1997
918Tulsa, Broken Arrow, BartlesvilleCentral (CST)Original1953

Area Code 405: Central Oklahoma

Established in 1947 as one of Oklahoma’s original area codes, 405 serves central Oklahoma including Oklahoma City, Norman, Edmond, and Stillwater. Originally covering the entire state, it was later reduced through splits in 1953 and 1997. The 572 overlay was added in 2021 due to number exhaustion. Today, 405/572 serves approximately 1.7 million residents across 19 counties. All local calls require 10-digit dialing.

Area Code 539: Northeastern Oklahoma Overlay

Introduced on January 28, 2011, as Oklahoma’s first overlay, 539 serves the same northeastern Oklahoma region as 918, including Tulsa, Broken Arrow, and Bartlesville. The overlay was chosen over a geographic split to prevent existing customers from changing phone numbers as the 918 area code approached exhaustion. Both codes coexist throughout the region, with 10-digit dialing required for all local calls.

Area Code 572: Oklahoma City Overlay

✨ NEW: Activated May 24, 2021

Oklahoma’s newest area code, 572 serves the same central Oklahoma region as 405, covering Oklahoma City and surrounding communities. Approved in January 2020, it was implemented when 405 was projected to exhaust by December 2021. Existing 405 numbers remained unchanged, but all new service may receive either code. Ten-digit dialing is mandatory for all local calls throughout the 405/572 region.

Area Code 580: Southern and Western Oklahoma

Created on November 1, 1997, by splitting from 405, area code 580 serves southern and western Oklahoma including Lawton, Enid, Ponca City, Duncan, and Ardmore. Covering approximately half the state’s geographic area, it serves rural communities, agricultural regions, and military installations like Fort Sill. The 580 region has no overlay and may allow 7-digit dialing in some areas, though 10-digit dialing is recommended statewide.

Area Code 918: Tulsa and Northeastern Oklahoma

Introduced on September 1, 1953, as Oklahoma’s second area code, 918 serves Tulsa and northeastern Oklahoma including Broken Arrow, Bartlesville, and Muskogee. With approximately 1.5 million residents, it’s Oklahoma’s most populous area code. The 539 overlay was added in 2011 to prevent number exhaustion. Major economic centers and Fortune 500 companies operate in this region. Ten-digit dialing is required for all local calls.

Understanding Time Zones in Oklahoma

The entire state of Oklahoma operates in the Central Time Zone (CT). During standard time (November through March), Oklahoma observes Central Standard Time (CST), which is UTC-6. During daylight saving time (March through November), the state observes Central Daylight Time (CDT), which is UTC-5.

Daylight Saving Time Observance

Unlike neighboring Arizona, Oklahoma fully observes daylight saving time. Clocks spring forward one hour on the second Sunday in March and fall back one hour on the first Sunday in November.

Scheduling Across Time Zones

When scheduling calls or meetings with people in Oklahoma, remember that the state is one hour behind Eastern Time, one hour ahead of Mountain Time, and two hours ahead of Pacific Time. For example, when it’s noon in Oklahoma, it’s 1:00 PM in New York, 11:00 AM in Denver, and 10:00 AM in Los Angeles.

Oklahoma Cities and Their Area Codes

  1. Oklahoma City – 405, 572 (Population: ~650,000)
  2. Tulsa – 918, 539 (Population: ~410,000)
  3. Norman – 405, 572 (Population: ~125,000)
  4. Broken Arrow – 918, 539 (Population: ~110,000)
  5. Lawton – 580 (Population: ~92,000)
  6. Edmond – 405, 572 (Population: ~95,000)
  7. Moore – 405, 572 (Population: ~62,000)
  8. Midwest City – 405, 572 (Population: ~58,000)
  9. Enid – 580 (Population: ~50,000)
  10. Stillwater – 405, 572 (Population: ~50,000)
  11. Muskogee – 918, 539 (Population: ~37,000)
  12. Bartlesville – 918, 539 (Population: ~36,000)
  13. Owasso – 918, 539 (Population: ~36,000)
  14. Shawnee – 405, 572 (Population: ~32,000)
  15. Ponca City – 580 (Population: ~24,000)

How to Use Area Codes in Oklahoma

Local Calling Requirements

In overlay areas (405/572 and 918/539), all local calls require 10-digit dialing. You must dial the area code plus the seven-digit phone number, even when calling within the same area code. In the 580 area code region, which has no overlay, 7-digit dialing may still work for some local calls, but 10-digit dialing is recommended statewide.

Calling from Outside Oklahoma

To call Oklahoma from elsewhere in the United States, dial 1 + area code + seven-digit number. For example, to call an Oklahoma City number, dial 1-405-555-0123.

International Dialing Format

To call Oklahoma from outside North America, dial your country’s international access code (often 00 or 011), then 1 (the US country code), then the area code and phone number. For example, from the UK: 00-1-405-555-0123.

Mobile and Landline Considerations

Oklahoma area codes apply to both landline and mobile phones. With number portability, a person with a 918 area code may have moved to the 405 region but kept their original number. Area codes no longer reliably indicate a caller’s current location, especially for mobile phones.

Additional Resources

For more information about Oklahoma area codes and telecommunications:

Explore area codes in neighboring states: