Area Code 313-999 located in DETROIT, WAYNE, MI, more detail is as below. Place NPA (Numbering Plan Area) : 313 NXX (Local Number Prefix) : 999 City : DETROIT County : WAYNE State : MI (Michigan) NXX Use Type : Wireless NXX Intro Version : 1998-11-20 FIPS (Federal Information Processing Standards) : 26163 LATA (Local Access Transport Area) : 340 Rate Center : DETROITZN6 ZIP Code Count : 8 ZIP Code Frequency : 80 ZIP Code : 48204 Other Information NPANXX : 313999 County Population : 0 Switch CLLI (Common Language Location Identifier) : WSLDMI05CM0 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 : SPRINT SPECTRUM L.P. OCN (Operating Company Number) : 6664 Coverage Area Name : MELVINDALE Latitude : 42.2988 Longitude : -83.1936 ‹ previous : 313-999 next › : 314-200 Telephone Number List 313-999-0000 ~ 313-999-9999