Significant events for area code 817
| Date |
Details |
| 1953 | The eastern area of 915 and a small part of 214 were combined to create 817. |
| 1957 | The northeastern part of the 915 area code (including the Texas Panhandle) and a small area of 817 were combined to create 806 |
| July 25, 1997 | Three way split of 817 with 940 covering the northern area and 254 covering the southern area (with 817 in the central area) |
| October 7, 2000 | Area code 682 was overlaid on 817 |