The state of Oklahoma is served by the following area codes:

• 405: Central Oklahoma including Oklahoma City (original area code created in 1947; 572 added as overlay on April 24, 2021^[1][2][3]
• 580: Western and southern Oklahoma (split from 405 in 1997)
• 539/918: Northeastern Oklahoma including Tulsa (918 created in 1953 as split from 405; 539 added as overlay in 2011)