Area code 405 serves the
U.S. state of Oklahoma.
the Oklahoma City
Metropolitan Area including cities such as Oklahoma
City, Edmond, El
Reno, Norman, Stillwater, Shawnee, Chickasha, Tuttle, and Moore.
two area codes serving Oklahoma are 918, which covers northeastern Oklahoma
(including the city of Tulsa) and
580 which serves western and southern
Prior to January 1, 1953, all of Oklahoma was contained within 405.
On that date, northeastern Oklahoma was assigned area code 918. On
November 1, 1997, 405 was reduced to cover only central Oklahoma,
while the remainder of the state was assigned area code 580.