Significant events for New York City overlays
| Date |
Details |
| New York City has had several overlays. This is the detail. | |
| Manhattan | |
| July 1, 1999 | Area code 646 was overlaid on Manhattan. |
| June 10, 2017 | Area code 332 was overlaid on Manhattan. |
| Brooklyn, Bronx, Queens, Staten Island | |
| October 1, 1999 | Area code 347 was overlaid on the above boroughs. |
| April 16, 2011 | Area code 929 was overlaid on the above boroughs. |
| All Boroughs | |
| February 4, 1992 | Area code 929 was overlaid on the above boroughs. |