Area Code 231-308 located in CHARLEVOIX, CHARLEVOIX, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 308 City : CHARLEVOIX County : CHARLEVOIX State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 2001-03-03 FIPS (Federal Information Processing Standards) : 26029 LATA (Local Access Transport Area) : 348 Rate Center : CHARLEVOIX ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49720 Other Information NPANXX : 231308 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRQMIFOCA0 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : TELNET WORLDWIDE, INC. OCN (Operating Company Number) : 4632 Coverage Area Name : CHARLEVOIX Latitude : 45.3181 Longitude : -85.2600 ‹ previous : 231-307 next › : 231-309 Telephone Number List 231-308-0000 ~ 231-308-9999