Area Code 231-821 located in FREMONT, NEWAYGO, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 821 City : FREMONT County : NEWAYGO State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 26123 LATA (Local Access Transport Area) : 348 Rate Center : HOLTON ZIP Code Count : 19 ZIP Code Frequency : 2 ZIP Code : 49412 Other Information NPANXX : 231821 County Population : 0 Switch CLLI (Common Language Location Identifier) : HLTNMIXGRS0 MSA CBSA (Core Based Statistical Area) : Grand Rapids-Wyoming, MI MSA CBSA Code (Core Based Statistical Area) : 24340 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : FRONTIER NORTH, INC. - MI OCN (Operating Company Number) : 0695 Coverage Area Name : HOLTON Latitude : 43.4084 Longitude : -86.0820 ‹ previous : 231-821 next › : 231-821 Telephone Number List 231-821-0000 ~ 231-821-9999