The area code 315 is located in the western portion of northern New York and covers Syracuse, Utica, and Rome. It was installed as one of the original North American area codes created in 1947, when it was assigned to a numbering plan area (NPA) in central New York state that extended from the Canadian border with Ontario and Quebec southward to the Pennsylvania state line, including Binghamton and Syracuse. As of 2020, very few, if any, numbers in the 680 area code were in use. On March 15, 2022, a proclamation by Syracuse Mayor Ben Walsh and Onondaga County Executive Ryan McMahon declared recognition of 315 day.
The following cities, towns, villages, and hamlets are served by area code 315:
- Adams Center
- Adams
- Alder Creek
- Auburn
- Boonville
- Brantingham
- Brewerton
- Bridgeport
- Brookfield
- Camden
- Cape Vincent
- Carthage
- Castorland
- Cato
- Cazenovia
- Central Square
- Chaumont
- Chittenango
- Cicero
- Clayton
- Cleveland
- Clinton
- Constableville
- Copenhagen
- Croghan
- Deansboro
- Deer River
- Deferiet
- Delphi Falls
- Dexter
- Dolgeville
- Earlville
- East Syracuse
- Eaton
- Edmeston
- Ellisburg
- Evans Mills
- Fabius
- Fayetteville
- Felts Mills
- Forestport
- Fort Drum
- Frankfort
- Fulton
- Georgetown
- Glenfield
- Gouverneur
- Greig
- Hamilton
- Hannibal
- Harrisville
- Henderson
- Herkimer
- Hinckley
- Holland Patent
- Homer
- Hubbardsville
- Ilion
- Jamesville
- Jordan
- Lacona
- Lee Center
- Leonardsville
- Lewis
- Little Falls
- Liverpool
- Lowville
- Lorraine
- Lyons Falls
- Macedon
- Madison
- Mallory
- Mannsville
- Marcellus
- Martville
- Mc Connellsville
- Mexico
- Middleville
- Minoa
- Mohawk
- Moravia
- Morrisville
- Munnsville
- Naples
- New Hartford
- New Woodstock
- Newark
- North Bay
- North Brookfield
- North Lawrence
- Norwich
- Old Forge
- Oneida
- Oriskany
- Oriskany Falls
- Oswego
- Oxbow
- Parish
- Pennellville
- Phoenix
- Pierrepont Manor
- Pine Plains
- Plainville
- Port Byron
- Port Leyden
- Pulaski
- Raquette Lake
- Redfield
- Remsen
- Richfield Springs
- Rodman
- Rome
- Sackets Harbor
- Saint Johnsville
- Sandy Creek
- Sauquoit
- Savannah
- Sherrill
- Sodus
- Sodus Point
- Solvay
- South Colton
- South Rutland
- Sterling
- Sylvan Beach
- Taberg
- Theresa
- Three Mile Bay
- Tully
- Turin
- Union Springs
- Utica
- Vernon
- Vernon Center
- Verona
- Waddington
- Watertown
- Waterville
- Weedsport
- West Edmeston
- West Leyden
- West Monroe
- West Winfield
- Whitesboro
- Williamstown
- Woodgate
- Yorkville
