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Updated Jan 02, 2010Area Code 331
  1. "E" is Eastern Time Zone, "C" is Central Time Zone, "M" is Mountain Time Zone, and "P" is Pacific Time Zone. Occasionally, an area code will fall in more than one time zone. In this case, the abbreviation is a combination of the previous abbreviations. Some area codes are shown with time zones referencing Universal Coordinated Time (UTC).
  2. Additional technical status can be retrived from the North American Numbering Plan Administration on the 331 area code specific link here.
Area Code331 (area code map)
LocationIllinois
Dates and historical informationArea code 331 went live into service on October 07, 2007 (The paperwork process started on July 23, 1999).  It was formed as a subdivision of the 630 area code.
Growth StatusThis area code went live on October 07, 2007 as a result of a subdivision of the 630 area code.  
Technical Status 2Area code 331 is currently live and in service.
Time Zone(s) 1C
LATA numbers served358
Number of rate centers served7
List of rate centersELMHURST, GENEVA, AURORA, NAPERVILLE, ST CHARLES, W CHICAGO, DOWNERSGRV
Number of major cities served11
Names of major cities served (ZIP code)(00000), Elmhurst (60126), Geneva (60134), Aurora (60505), Roselle (60172), Keeneyville (60172), Lombard (60148), Flowerfield (60148), West Chicago (60185), Northwoods (60185), Downers Grove (60515), Oswego (60543)
Number of exchanges served22
List of exchanges served331-221-xxxx, 331-248-xxxx, 331-262-xxxx, 331-330-xxxx, 331-332-xxxx, 331-333-xxxx, 331-422-xxxx, 331-425-xxxx, 331-442-xxxx, 331-452-xxxx, 331-454-xxxx, 331-457-xxxx, 331-465-xxxx, 331-472-xxxx, 331-481-xxxx, 331-575-xxxx, 331-625-xxxx, 331-642-xxxx, 331-643-xxxx, 331-645-xxxx, 331-684-xxxx, 331-826-xxxx
Number of telephone companies14 telephone companies servicing the 331 area code
List of telephone companiesAMERITECH ILLINOIS, COMCAST PHONE OF ILLINOIS, LLC - IL, SPRINT SPECTRUM L.P., CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL, DENALI SPECTRUM LICENSE, LLC, T-MOBILE USA, INC., BROADWING COMMUNICATIONS, LLC - IL, NEW CINGULAR WIRELESS PCS, LLC - IL, PAETEC COMMUNICATIONS, INC. - IL, US XCHANGE OF ILLINOIS LLC DBA CHOICE ONE COMM IL, GLOBAL CROSSING LOCAL SERVICES, INC.-IL, BANDWIDTH.COM CLEC, LLC - IL, MCI WORLDCOM COMMUNICATIONS, INC. - IL, SIGECOM, LLC - IL

331 Area Code Map

 
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