| Oklahoma | 
| State of Oklahoma - Phone Code and Area Codes for Mobile, Whatsapp and Text Messages | 
| Phone and Whatsapp Codes in Oklahoma / OK - Area Code : 580 | 
| Area Code : 918 NorthEast | 
| Area Code : 405 Southern and Western | 
| US Code List of Codes in USA. Area Code and Phone Information by City and State. |