Area Code 231-301 located in HART, OCEANA, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 301 City : HART County : OCEANA State : MI (Michigan) NXX Use Type : Wireless NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26127 LATA (Local Access Transport Area) : 348 Rate Center : HART ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49420 Other Information NPANXX : 231301 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRPMIBLCM5 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI OCN (Operating Company Number) : 6003 Coverage Area Name : HART Latitude : 43.6999 Longitude : -86.3711 ‹ previous : 231-299 next › : 231-302 Telephone Number List 231-301-0000 ~ 231-301-9999