Area Code 231-258 located in KALKASKA, KALKASKA, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 258 City : KALKASKA County : KALKASKA State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26079 LATA (Local Access Transport Area) : 348 Rate Center : KALKASKA ZIP Code Count : 3493 ZIP Code Frequency : 90 ZIP Code : 49646 Other Information NPANXX : 231258 County Population : 0 Switch CLLI (Common Language Location Identifier) : KLKSMIKKDS0 MSA CBSA (Core Based Statistical Area) : Traverse City, MI MSA CBSA Code (Core Based Statistical Area) : 45900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : AMERITECH MICHIGAN OCN (Operating Company Number) : 9323 Coverage Area Name : KALKASKA Latitude : 44.7311 Longitude : -85.1779 ‹ previous : 231-258 next › : 231-259 Telephone Number List 231-258-0000 ~ 231-258-9999