Area Code 231-450 located in HESPERIA, OCEANA, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 450 City : HESPERIA County : OCEANA State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 2005-03-27 FIPS (Federal Information Processing Standards) : 26127 LATA (Local Access Transport Area) : 348 Rate Center : HESPERIA ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49421 Other Information NPANXX : 231450 County Population : 0 Switch CLLI (Common Language Location Identifier) : TRCYMICICM2 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - IL OCN (Operating Company Number) : 6534 Coverage Area Name : HESPERIA Latitude : 43.5677 Longitude : -86.0318 ‹ previous : 231-448 next › : 231-452 Telephone Number List 231-450-0000 ~ 231-450-9999