Significant events for area code 305
| Date |
Details |
| 1947 | The original area code for Florida |
| 1953 | Area code 305 was split with 813 covering the southwestern area of Florida. |
| 1965 | Area code 305 was split with 904 covering the north area of Florida (including the panhandle). |
| 1988 | Area code 305 was split with 407 covering the eastern area, from Palm Beach County north and the Orlando metro area. |
| 1995 | Area code 305 was split with 954 covering Broward County. |
| March 1, 1998 | Area code 786 was overlaid on 305 (except for the Florida Keys). |
| September 1, 2001 | The Florida Keys were added to the 786 overlay. |
| August 4, 2023 | 645 was overlaid on 305. |