Significant events for area code 904
| Date |
Details |
| July 6, 1965 | Area code 305 was split with 904 covering the northern area of Florida (including the panhandle). |
| 1995 | Area code 904 was split with 352. |
| 1997 | Area code 904 was split with 352. |
| February 15, 2001 | Area code 904 was split with 386 covering the north central and southeastern areas of 904 (not contiguous with a large area of 352 between the two areas). |
| February 26, 2024 | Area code 904 was overlaid by 324. |