Area Code 231-533 located in CENTRAL LAKE, ANTRIM, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 533 City : CENTRAL LAKE County : ANTRIM State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26009 LATA (Local Access Transport Area) : 348 Rate Center : BELLAIRE ZIP Code Count : 44 ZIP Code Frequency : 2 ZIP Code : 49622 Other Information NPANXX : 231533 County Population : 0 Switch CLLI (Common Language Location Identifier) : BLLRMIXGDS0 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : FRONTIER NORTH, INC. - MI OCN (Operating Company Number) : 0695 Coverage Area Name : BELLAIRE Latitude : 44.9778 Longitude : -85.2084 ‹ previous : 231-532 next › : 231-533 Telephone Number List 231-533-0000 ~ 231-533-9999