Significant events for area code 217
| Date |
Details |
| 1947 | One of the four original area codes for Illinois. It ccvered south central Illinois. |
| 1954 | A boundary shift moved portions of the southern part of 217 into 618 . | 1957 | Area code 309 was created with 309 covering the southwestern area of 815 and part of northern 217 . |
| 2021 | Area code 447 was overlaid on 217 . |