Significant events for area code 602
| Date |
Details |
| 1947 | The original area code for Arizona |
| March 19, 1995 | Area code 602 was split with 520 covering all but the greater Phoenix metro area |
| September 1, 1999 | Area code 602 was split three ways with 480 covering the eastern part of the greater Phoenix metro area and 623 covering the western part. 602 remained in the middle |