Area Code 313-203 located in DEARBORN, WAYNE, MI, more detail is as below. Place NPA (Numbering Plan Area) : 313 NXX (Local Number Prefix) : 203 City : DEARBORN County : WAYNE State : MI (Michigan) NXX Use Type : Landline NXX Intro Version : 1995-02-11 FIPS (Federal Information Processing Standards) : 26163 LATA (Local Access Transport Area) : 340 Rate Center : DETROITZN6 ZIP Code Count : 2 ZIP Code Frequency : 29 ZIP Code : 48120 Other Information NPANXX : 313203 County Population : 0 Switch CLLI (Common Language Location Identifier) : SFLDMIBVDS0 MSA CBSA (Core Based Statistical Area) : Detroit-Warren-Livonia, MI MSA CBSA Code (Core Based Statistical Area) : 19820 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : TELEPORT COMMUNICATIONS AMERICA, LLC - MI OCN (Operating Company Number) : 770E Coverage Area Name : DETROIT Latitude : 42.4770 Longitude : -83.2437 ‹ previous : 313-203 next › : 313-204 Telephone Number List 313-203-0000 ~ 313-203-9999