What is what area code is 405?

The area code 405 is a telephone area code in the North American Numbering Plan (NANP) for the state of Oklahoma in the United States. It covers the central and western parts of the state, including major cities such as Oklahoma City, Edmond, Norman, and Stillwater. The area code was established in 1947 and currently serves primarily as the area code for the Oklahoma City metropolitan area.