NPA - 331 Illinois (IL)
The 331 Area Code is located in the state of Illinois. Area Code 331 is one of the 312 three-digit telephone area codes in the USA. It covers roughly 48,070 unique phone numbers and 8,885,919 individuals near the cities of Chicago-Naperville-Elgin.
NPA - 331 History: Area code 331 was put into service. Area code 331 is an overlay of area code 630.
There are a few special area codes with the last two digits 422 match, these are known as easily recognizable codes (ERCs). The 8xx set of numbers are reserved for toll-free services and communication.
Those numbers can be found in the following cities or locations: Illinois (IL).
331 Stats:
State: Illinois (IL)
Metro Area: Chicago-Naperville-Elgin
Nearby Area Codes:
219, 224, 262, 312, 331, 630, 708, 773, 779, 815, 847, 872,
Phone Prefixes: 111
Est. Population: 8,885,919
Phone Numbers: 48,070
Cities in area code 331:
Aurora, Bartlett, Downers Grove, Elburn, Elmhurst, Geneva, Lemont, Lombard, Naperville, Oswego, Roselle, Saint Charles, Sugar Grove, Warrenville, West Chicago, Wheaton, Yorkville.
Related phone operators in Area Code 331:
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.