Area Code 331-221 located in ELMHURST, DUPAGE, IL, more detail is as below. Place NPA (Numbering Plan Area) : 331 NXX (Local Number Prefix) : 221 City : ELMHURST County : DUPAGE State : IL (Illinois) NXX Use Type : Landline NXX Intro Version : 1/21/2009 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 : 331221 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 : AMERITECH ILLINOIS OCN (Operating Company Number) : 9329 Coverage Area Name : ELMHURST Latitude : 41.8953 Longitude : -87.9419 ‹ previous : 331-220 next › : 331-222 Telephone Number List 331-221-0000 ~ 331-221-9999