Significant events for area code 512
| Date |
Details |
| 1947 | One of the original four area codes for Texas. It covered the south central and southern part of the state. |
| November 1, 1992 | Area code 512 was split with 210 covering the western area |
| February 13, 1999 | Area code 512 was split with 361 covering the southeastern area |
| July, 2013 | Area code 737 was overlaid on 512 |