Area Code 815-668 located in JOLIET, WILL, IL, more detail is as below. Place NPA (Numbering Plan Area) : 815 NXX (Local Number Prefix) : 668 City : JOLIET County : WILL State : IL (Illinois) NXX Use Type : Wireless NXX Intro Version : 1998-11-20 FIPS (Federal Information Processing Standards) : 17197 LATA (Local Access Transport Area) : 360 Rate Center : JOLIET ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 60435 Other Information NPANXX : 815668 Switch CLLI (Common Language Location Identifier) : JOLTIL4E020 MSA CBSA (Core Based Statistical Area) : Chicago-Naperville-Joliet, IL-IN-WI MSA CBSA Code (Core Based Statistical Area) : 16980 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : NEUTRAL TANDEM-ILLINOIS, LLC - IL OCN (Operating Company Number) : 505B Coverage Area Name : ROCKFORD Latitude : 42.2672 Longitude : -89.0999 ‹ previous : 815-667 next › : 815-668 Telephone Number List 815-668-0000 ~ 815-668-9999