Significant events for area code 708
| Date |
Details |
| November 11, 1989 | Area code 312 was split with 708 covering the Chicago suburbs. |
| August 8, 1996 | Three-way split with 708 covering the southern area, 630 covering the central area and 847 covering the northern area. |
| January 21, 2022 | Area code 464 overlaid on 708. |