Significant events for area code 615
| Date |
Details |
| 1954 | Area code 901 was split with 615 covering the central and eastern areas of Tennessee and 901 covering the western area |
| September, 1995 | Area code 615 was split with 423 covering the eastern area of Tennessee |
| September, 1997 | Area code 615 was split with 931 surrounding the greater Nashville area on the western, eastern and southern sides. 615 extends to the northern Tennessee border |
| July 26, 2014 | Area code 629 was overlaid on 615 |