Significant events for area code 212
| Date |
Details |
| 1947 | One of the original five area codes for New York. It covered all of New York City (all boroughs). |
| 1984 | Area code 212 was split with 718 covering Brooklyn, Queens and Staten Island. The Bronx and Manhattan remained in 212. |
| 1992 | Area code 718 was increased to include the Bronx, leaving only Manhattan in 212. |
| New York City overlays, . |