Area Code 585-203 located in EAST ROCHESTER, MONROE, NY, more detail is as below. Place NPA (Numbering Plan Area) : 585 NXX (Local Number Prefix) : 203 City : EAST ROCHESTER County : MONROE State : NY (New York) NXX Use Type : Landline NXX Intro Version : 2005-10-13 FIPS (Federal Information Processing Standards) : 36055 LATA (Local Access Transport Area) : 974 Rate Center : EROCHESTER ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 14445 Other Information NPANXX : 585203 County Population : 0 Switch CLLI (Common Language Location Identifier) : ERCHNYXADS0 MSA CBSA (Core Based Statistical Area) : Rochester, NY MSA CBSA Code (Core Based Statistical Area) : 40380 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : E ROCHESTER Latitude : 43.1129 Longitude : -77.4857 ‹ previous : 585-202 next › : 585-204 Telephone Number List 585-203-0000 ~ 585-203-9999