The 845 area code is located in southeastern New York and covers Dutchess, Orange, Putnam, Rockland, Sullivan, and Ulster counties, as well as parts of Columbia, Delaware, and Greene counties. It was created on June 5, 2000, by an area code split from most of the territory of area code 914, which was retained by Westchester County. The 845 area code is the only area code that serves the area. On May 11, 2022, the North American Numbering Plan Administrator (NANPA) authorized the new area code 329 for an overlay of the 845 area, with an effective in-service date of March 24, 2023.