312 Area Code Prefixes Directory

If you know the complete number you’re looking up, please use the Phone Number Search above. Or to explore prefixes in different coverage areas, please use the tables below.

Ameritech Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Allegiance Telecom
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

First Communications LLC
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

United States Cellular Corp. - Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Bandwidth.com Clec
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

AT&T; Local
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Teleport Communications America
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Mcimetro Access Transmission Services LLC
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Access One
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Global Crossing Local Services-il
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Xo Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Sigecom
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Net Talk.com
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Level 3 Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Neutral Tandem-illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Rcn Telecom Services Of Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Cbeyond Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Ovation Communications Of Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Mci Worldcom Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Us Xchange Of Illinois LLC DBA Choice One Comm Il
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Ymax Communications Corp.
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Pg Telecom Of Illinois Inc.
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Cimco Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Peerless Network Of Illinois
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Broadvox-clec
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Centurylink Communications LLC
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Indiana Paging Ntwk
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Tw Telecom Of Illinois LLC
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Citrix Communications LLC
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Cricket Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

365 Wireless
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

Paetec Communications
Carrier

Coverage Area
Counties: Cook
Cities: Chicago

The 312 area code is located in Chicago, Illinois including Northbrook, Wheeling and was originally put into service on February 4th 1994. Find whose number this is.

Recently Reported Numbers

(312) 667-8852Dangerous

Computerized voice

(312) 667-8848Dangerous

loanoffer scam

(312) 667-8852Unknown

SCAM

(312) 667-8871Dangerous

Automated caller.

(312) 667-8840Dangerous

Spam

(312) 340-5585Unknown

Why should we

(312) 340-5585Unknown

Answering an 8 year old post? I guess you will never know....

(312) 282-6526Neutral

Just silent for a couple of sec.

(312) 871-4243Unknown

Appears to be legitimately a survey on behalf of CDC based on the confirmation of information on CDC NIS website, but still unwanted robocall.

(312) 761-4809Dangerous

This is a timeshare repurchase scam. They'll make you an overly generous offer for your timeshare, then require you to wire funds to a Mexican bank for "closing costs and fees." And you'll never hear from them again. (If you have a timeshare, go check redweek.com to see what it's worth on the resale market. It will be far, far less than the offer from Chicago Capital Realty.)

Recently Searched Numbers

No additional information reported for these searched numbers. Received a call from any phone number listed below? Please consider helping the community by reporting your experience.

312-412-2477
Report
New Cingular Wireless PCS
312-670-4398
Report
Ameritech Illinois
312-819-6770
Report
Ameritech Illinois
312-351-7353
Report
New Cingular Wireless PCS
312-945-7222
Report
Ameritech Illinois
312-111-7206
Report
UNKNOWN
312-854-7400
Report
Rcn Telecom Services Of Illinois
312-920-9753
Report
Ameritech Illinois
312-253-6378
Report
Allegiance Telecom
312-996-9207
Report
Ameritech Illinois
312-151-5819
Report
UNKNOWN
312-850-9229
Report
Ameritech Illinois
312-192-4570
Report
UNKNOWN
312-813-4713
Report
New Cingular Wireless PCS
312-511-1100
Report
UNKNOWN
312-120-9756
Report
UNKNOWN
312-848-3932
Report
Cellco Partnership DBA Verizon Wireless
312-235-3777
Report
Ameritech Illinois
312-740-2661
Report
American Messaging (am)

Most searched numbers

Cell
All TimeThis Month
312-467-7965First seen 2016-12-23312-670-9360First seen 2010-04-06
312-384-2456First seen 2011-12-02312-732-7155First seen 2013-10-26
312-305-1134First seen 2018-12-10312-219-8674First seen 2010-05-27
312-590-1542First seen 2011-04-10312-917-2321First seen 2012-07-12
312-288-9227First seen 2019-10-28312-598-2876First seen 2012-09-05
Landline
All TimeThis Month
312-993-3917First seen 2016-10-10312-787-9960First seen 2017-12-11
312-182-7820First seen 2015-04-15312-122-5608First seen 2018-04-21
312-218-1288First seen 2011-10-08312-412-5225First seen 2014-03-12
312-184-9879First seen 2013-09-15312-743-7808First seen 2012-02-07
312-401-3743First seen 2016-03-01312-709-1113First seen 2017-11-06

Cities With coverage

CITY LIST
Chicago
Hinsdale
La Grange Park
Northbrook
Roselle
Wheeling