Area Code 231-388 located in TUSTIN, OSCEOLA, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 388 City : TUSTIN County : OSCEOLA State : MI (Michigan) NXX Use Type : Wireless NXX Intro Version : 2003-11-11 FIPS (Federal Information Processing Standards) : 26133 LATA (Local Access Transport Area) : 348 Rate Center : LE ROY ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49688 Other Information NPANXX : 231388 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRPMINSCM0 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 : LEROY Latitude : 44.0341 Longitude : -85.4488 ‹ previous : 231-388 next › : 231-389 Telephone Number List 231-388-0000 ~ 231-388-9999