Area Code 231-520 located in CHARLEVOIX, CHARLEVOIX, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 520 City : CHARLEVOIX County : CHARLEVOIX State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 2003-02-09 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 : 231520 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRPMIBLX8Z Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : LOCAL EXCHANGE CARRIERS OF MICHIGAN, INC. - MI OCN (Operating Company Number) : 2550 Coverage Area Name : CHARLEVOIX Latitude : 45.3181 Longitude : -85.2600 ‹ previous : 231-519 next › : 231-522 Telephone Number List 231-520-0000 ~ 231-520-9999