Area Code 231-790 located in FREE SOIL, MASON, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 790 City : FREE SOIL County : MASON State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 2001-10-31 FIPS (Federal Information Processing Standards) : 26105 LATA (Local Access Transport Area) : 348 Rate Center : FREESOIL ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49411 Other Information NPANXX : 231790 County Population : 0 Switch CLLI (Common Language Location Identifier) : GDRPMIBLY4X Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : LONG DISTANCE OF MICHIGAN, INC. DBA LDMI - MI OCN (Operating Company Number) : 0975 Coverage Area Name : FREE SOIL Latitude : 44.0976 Longitude : -86.2176 ‹ previous : 231-789 next › : 231-791 Telephone Number List 231-790-0000 ~ 231-790-9999