Phone numbers in the 331 area code can be found in 18 cities or locations.
Those phone numbers can be found in the following cities or locations: Aurora, Bartlett, Downers Grove, Elburn, Elmhurst, Geneva, Lemont, Lombard, Naperville, Oswego, Roselle, Saint Charles, Sugar Grove, Warrenville, West Chicago, Wheaton, Yorkville.
The carriers providing phone numbers in this area code are: Ameritech Illinois, Bandwidth.com Clec, Broadvox-clec, Cellco Partnership DBA Verizon Wireless, Cibolo Creek Ventures DBA Routepoint Comm Il, Comcast Phone Of Illinois DBA Comco, Cricket Communications, Digital Network Access Communications, First Communications LLC, Level 3 Communications, Local Access LLC, Mci Worldcom Communications, New Cingular Wireless PCS, Ovation Communications Of Illinois, Peerless Network Of Illinois, Sbc Internet Services, Sigecom, Sprint Spectrum L.p., T-mobile Usa, Teleport Communications America, Xo Illinois.