National Phone Number Registry NPNR

Area Code 331 Location

Area code 331 is currently assigned for use in Illinois since Oct 07, 2007. This area code originated from the 630 area code previously by means of area code split or overlay. View all phone prefixes used in area code 331 or other area codes in Illinois.

(331)
Enter 7-digit phone number for area code 331 or the complete 10-digit phone number

Phone Prefixes for Area Code 331

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Area code Location Company / Service Provider
331-200 BARTLETT, IL T-MOBILE USA, INC.
331-201 DOWNERS GROVE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-202 ELMHURST, IL SPRINT SPECTRUM L.P.
331-203 AURORA, IL SPRINT SPECTRUM L.P.
331-204 NAPERVILLE, IL NEUTRAL TANDEM-ILLINOIS, LLC - IL
331-205 AURORA, IL T-MOBILE USA, INC.
331-206 AURORA, IL SPRINT SPECTRUM L.P.
331-207 YORKVILLE, IL LEVEL 3 COMMUNICATIONS, LLC - IL
331-208 AURORA, IL SPRINT SPECTRUM L.P.
331-209 ELMHURST, IL LEVEL 3 COMMUNICATIONS, LLC - IL
331-210 ST CHARLES, IL PEERLESS NETWORK OF ILLINOIS, LLC - IL
331-212 AURORA, IL MCI WORLDCOM COMMUNICATIONS, INC. - IL
331-213 NAPERVILLE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-214 DOWNERS GROVE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-215 NAPERVILLE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-216 OSWEGO, IL NEW CINGULAR WIRELESS PCS, LLC - IL
331-218 WHEATON, IL T-MOBILE USA, INC.
331-219 AURORA, IL TELNYX LLC
331-220 AURORA, IL SPRINT SPECTRUM L.P.
331-221 ELMHURST, IL AMERITECH ILLINOIS
331-222 ST CHARLES, IL NEW CINGULAR WIRELESS PCS, LLC - IL
331-223 ST CHARLES, IL NEW CINGULAR WIRELESS PCS, LLC - IL
331-225 ELMHURST, IL SPRINT SPECTRUM L.P.
331-226 NAPERVILLE, IL T-MOBILE USA, INC.
331-227 Sugar Grove, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-228 ST CHARLES, IL OVATION COMMUNICATIONS OF ILLINOIS, INC.
331-229 NAPERVILLE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-230 AURORA, IL T-MOBILE USA, INC.
331-233 DOWNERS GROVE, IL TELNYX LLC
331-234 Sugar Grove, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-236 WHEATON, IL T-MOBILE USA, INC.
331-240 W CHICAGO, IL PEERLESS NETWORK OF ILLINOIS, LLC - IL
331-245 BARTLETT, IL T-MOBILE USA, INC.
331-248 GENEVA, IL COMCAST PHONE OF ILLINOIS, LLC DBA COMCO - IL
331-250 AURORA, IL T-MOBILE USA, INC.
331-251 DOWNERS GROVE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-252 Warrenville, IL TELEPORT COMMUNICATIONS AMERICA, LLC - IL
331-253 LEMONT, IL T-MOBILE USA, INC.
331-254 Sugar Grove, IL T-MOBILE USA, INC.
331-256 AURORA, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-262 AURORA, IL SPRINT SPECTRUM L.P.
331-263 ITASCA, IL NEUTRAL TANDEM-ILLINOIS, LLC - IL
331-276 ST CHARLES, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-281 NAPERVILLE, IL AMERITECH ILLINOIS
331-300 AURORA, IL T-MOBILE USA, INC.
331-301 AURORA, IL LOCAL ACCESS LLC - IL
331-302 AURORA, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
331-303 ELBURN, IL CIBOLO CREEK VENTURES, LLC DBA ROUTEPOINT COMM IL
331-304 BARTLETT, IL T-MOBILE USA, INC.
331-305 NAPERVILLE, IL CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL
New numbers being added to 331 area code
Effective: 04/30/2017
331-219 in AURORA, IL
TELNYX LLC
Effective: 05/18/2017
331-226 in NAPERVILLE, IL
T-MOBILE USA, INC.
Effective: 06/03/2017
331-230 in AURORA, IL
T-MOBILE USA, INC.
Effective: 04/27/2017
331-233 in DOWNERS GROVE, IL
TELNYX LLC
Effective: 06/02/2017
331-236 in WHEATON, IL
T-MOBILE USA, INC.
331 Area Code Information
Type of code: General Purpose Code
Location: IL - US
Time zone: C
Assigned for use: Yes
Code in service: Yes
Service date: October 07, 2007
In jeopardy: No
Relief in progress: No
NPA Relief status:
Code assignable: Yes
Geographic or
non-geographic:
G
Reserved for future use: No
Planning letter(s): 362 357 195
Overlay code: Yes
Overlay complex: 331/630
Dialing plan Standard Permissive
Home local calls: 1+10D NA
Foreign local calls: 1+10D NA
Home toll calls: 1+10D NA
Foreign toll calls: 1+10D -

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