Area code 405, Telephone prefix in central Oklahoma, US.
Area code 405 covers Oklahoma City and surrounding communities including Norman, Edmond, Stillwater, Shawnee, and Moore. It serves the communication needs of millions of residents and businesses across central Oklahoma.
Area code 405 was established in 1947 as one of the original North American numbering plan codes, initially covering the entire state. Population growth eventually led to the creation of area codes 580 and 918 to manage demand.
The telephone prefix 405 connects Oklahoma City's diverse population of 638,000 residents, supporting communication networks for businesses, universities, and government institutions.
Ten-digit dialing has been mandatory since 2021, when overlay code 572 was introduced to accommodate growing demand for telephone numbers. Both numbers serve the same geographic area and function alongside each other.
Area code 405 is the only one in Oklahoma that does not border neighboring states, maintaining a central position within state boundaries. This geographic feature distinguishes it from all other area codes in the state.
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