Area Code 231-203 located in ALANSON, EMMET, MI, more detail is as below. Place NPA (Numbering Plan Area) : 231 NXX (Local Number Prefix) : 203 City : ALANSON County : EMMET State : MI (Michigan) NXX Use Type : Wireless NXX Intro Version : 2004-08-17 FIPS (Federal Information Processing Standards) : 26047 LATA (Local Access Transport Area) : 348 Rate Center : ALANSON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 49706 Other Information NPANXX : 231203 County Population : 0 Switch CLLI (Common Language Location Identifier) : TRCYMICICM2 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - IL OCN (Operating Company Number) : 6534 Coverage Area Name : ALANSON Latitude : 45.4413 Longitude : -84.7908 ‹ previous : 231-202 next › : 231-204 Telephone Number List 231-203-0000 ~ 231-203-9999