Area Code 315-221 located in WATERTOWN, JEFFERSON, NY, more detail is as below. Place NPA (Numbering Plan Area) : 315 NXX (Local Number Prefix) : 221 City : WATERTOWN County : JEFFERSON State : NY (New York) NXX Use Type : Landline NXX Intro Version : 1997-07-06 FIPS (Federal Information Processing Standards) : 36045 LATA (Local Access Transport Area) : 136 Rate Center : WATERTOWN ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 13603 Other Information NPANXX : 315221 County Population : 0 Switch CLLI (Common Language Location Identifier) : SYRCNYSWDS0 MSA CBSA (Core Based Statistical Area) : Watertown-Fort Drum, NY MSA CBSA Code (Core Based Statistical Area) : 48060 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : TELEPORT COMMUNICATIONS GROUP - NY OCN (Operating Company Number) : 7140 Coverage Area Name : WATERTOWN Latitude : 43.9752 Longitude : -75.9162 ‹ previous : 315-220 next › : 315-222 Telephone Number List 315-221-0000 ~ 315-221-9999