Area Code 231-220 located in MUSKEGON, MUSKEGON, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 220 City : MUSKEGON County : MUSKEGON State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 2003-08-31 FIPS (Federal Information Processing Standards) : 26121 LATA (Local Access Transport Area) : 348 Rate Center : MUSKEGON ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49441 Other Information NPANXX : 231220 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRPMIBLX8Z MSA CBSA (Core Based Statistical Area) : Muskegon-Norton Shores, MI MSA CBSA Code (Core Based Statistical Area) : 34740 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 : MUSKEGON Latitude : 43.2362 Longitude : -86.2433 ‹ previous : 231-219 next › : 231-220 Telephone Number List 231-220-0000 ~ 231-220-9999