Area Code 781-423 located in ROCKLAND, PLYMOUTH, MA, more detail is as below. Place NPA (Numbering Plan Area) : 781 NXX (Local Number Prefix) : 423 City : ROCKLAND County : PLYMOUTH State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1998-11-20 FIPS (Federal Information Processing Standards) : 25023 LATA (Local Access Transport Area) : 128 Rate Center : ROCKLAND ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 02370 Other Information NPANXX : 781423 Switch CLLI (Common Language Location Identifier) : FRMNMAWA0MD MSA CBSA (Core Based Statistical Area) : Boston-Cambridge-Quincy, MA-NH MSA CBSA Code (Core Based Statistical Area) : 14460 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : AT&T LOCAL OCN (Operating Company Number) : 7421 Coverage Area Name : ROCKLAND Latitude : 42.1294 Longitude : -70.9136 ‹ previous : 781-422 next › : 781-424 Telephone Number List 781-423-0000 ~ 781-423-9999