The U.S. state of Alabama is served by six area codes. When the North American Numbering Plan was first defined in 1947, Alabama was a single numbering plan area (NPA), with area code 205. This configuration existed until 1995 when area code 334 was added for the southeastern part of the state. In 1998, area code 256 was assigned for northern Alabama. It had an overlay area code 938 added in 2010, which required ten-digit dialing. The area code 251 in south Alabama was split area code from 334 in 2001. Area code 659 was installed in 2019, after having been proposed in 2001.
| Area code | Established | Parent NPA | Overlay | Numbering plan area | Map |
|---|---|---|---|---|---|
| 205 | 1947 | – | 205/659 | Central and west central Alabama; Entire state before the creation of area code 334 |  |
| 659 | 2019 | 205 | Central and west central Alabama, including Birmingham, Tuscaloosa, Hoover, Northport, Jasper, Oneonta, Clanton, and Pell City | ||
| 256 | 1998 | 205 | 256/938 | Northern and east central Alabama, including Huntsville-Decatur, Florence-Muscle Shoals, Gadsden, Anniston, Alexander City, and Sylacauga |  |
| 938 | 2010 | 256 | |||
| 334 | 1995 | 205 | – | South central and southeastern Alabama, including Montgomery, Auburn-Opelika, Dothan, Valley, and Selma; southern half of the state before area code 251 created; |  |
| 251 | 2001 | 334 | – | Southwestern Alabama, including Mobile, Monroeville, Atmore, Gulf Shores, and Daphne |  |