New York currently utilizes 19 area codes. When first established by AT&T and the Bell System in 1947, 212 covered New York City, 315 covered central upstate New York including Syracuse, 518 covered northeastern New York including Albany, 716 covered western New York including Buffalo and Rochester, and 914 covered southern New York including Long Island but not including New York City. The most recently added was 838 in 2017 as an overlay to 518. Today, 718 is the most populated with an estimated 6.7 million of the state's 19.4 million residents.
Sources: North American Numbering Plan Administration (NANPA), telecom providers, and the U.S. Census Bureau.