Significant events for area code 416
| Date |
Details |
| 1947 | One of the two original area codes for Ontario, covering the southern and central eastern areas of Ontario |
| 1953 | The southwestern area of area code 416 and the northern area of 613 were combined to create 519 |
| 1957 | The central area of area code 613 and the northern area of 416 were combined to create 705 |
| 1993 | Area code 416 was split with 905 covering all but the central Toronto metro area |
| Ontario 416 overlays . |