Significant events for area code 310
| Date |
Details |
| November 2, 1991 | Area code 213 was split, with 310 covering the southern and western areas of 213 |
| January 25, 1997 | Area code 310 was split, with area code 562 covering the southern part of 310 |
| August 26, 2006 | Area code 424 was ovelaid on 310. |