Area code 518 is a telephone area code in eastern upstate New York, established as one of the original area codes in 1947. It covers 24 counties and 1,200 ZIP codes. It has 493 landline and 100 wireless exchanges serviced by 47 carriers. It is the largest area code in size in New York, extending from the eastern Mohawk Valley to the Vermont border, and from the Canada–US border to south of Albany. The bulk of the area code's population is in the Capital District (Albany, Schenectady, and Troy). Other major cities in the area code are Glens Falls and Plattsburgh.