Oklahoma currently utilizes 5 area codes. When first established by AT&T and the Bell System in 1947, 405 covered the entire state of Oklahoma. The most recently added was 572 in 2021 as an overlay to 405. Today, 918 is the most populated with an estimated 1.5 million of the state's 3.8 million residents.
Timezone:Central
Timezone:Central
539 is an overlay for area code 918.
Timezone:Central
572 is an overlay for area code 405.
Timezone:Central
Timezone:Central