Area Code 331-642 located in ELMHURST, DUPAGE, IL, more detail is as below. Place NPA (Numbering Plan Area) : 331 NXX (Local Number Prefix) : 642 City : ELMHURST County : DUPAGE State : IL (Illinois) NXX Use Type : Wireless NXX Intro Version : 6/19/2008 FIPS (Federal Information Processing Standards) : 17043 LATA (Local Access Transport Area) : 358 Rate Center : ELMHURST ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 60126 Other Information NPANXX : 331642 County Population : 0 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 Overlay : L Company : BANDWIDTH.COM CLEC, LLC - IL OCN (Operating Company Number) : 984E Coverage Area Name : ELMHURST Latitude : 41.9016 Longitude : -87.9445 ‹ previous : 331-625 next › : 331-643 Telephone Number List 331-642-0000 ~ 331-642-9999