Significant events for area code 508
| Date |
Details |
| July 16, 1988 | Area code 617 was split with 508 covering central and southern Massachusetts |
| August 1, 1997 | Area code 508 was split with 978 covering the north central and northeastern area of Massachusetts |
| May 2, 2001 | Area code 774 was overlaid on 508 |