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) 897-2060Dangerous

Called my wife. When I said they would have to speak slowly because she was deaf and using a caption-call telephone, they hung up.

(312) 535-7070Unknown

I answered the call on Tuesday morning. Caller hung up on me and continues to call.

(312) 578-7031Neutral

They don’t stop calling me. Everyday I get about 1-2 phone calls and hang up right away. The previous owner of my new number, I’m getting constant calls and texts for.

(312) 800-8982Dangerous

Merchant Services scammers

(312) 500-2837Dangerous

Figures they didn't/ wouldn't leave a message.

(312) 509-7543Unknown

Potential spam, I never pick up calls from unfamiliar numbers - I just let it go to voice mail and if they're legit they can leave a message.

(312) 736-0524Unknown

Too many calls from this number. I have now blocked it.

(312) 766-0163Unknown

Calling my house

(312) 291-5283Unknown

Who is the owner?

(312) 267-0861Unknown

Called my unpublished home number.

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.

312-305-8884
Report
Cellco Partnership DBA Verizon Wireless
312-467-7226
Report
Ameritech Illinois
312-848-9042
Report
Cellco Partnership DBA Verizon Wireless
312-508-5074
Report
Peerless Network Of Illinois
312-868-2168
Report
UNKNOWN
312-209-6524
Report
Cellco Partnership DBA Verizon Wireless
312-470-8929
Report
Mcimetro Access Transmission Services LLC
312-183-5692
Report
UNKNOWN
312-372-5946
Report
Ameritech Illinois
312-995-5908
Report
UNKNOWN
312-294-6807
Report
Ameritech Illinois
312-593-7144
Report
T-mobile Usa
312-903-2626
Report
American Messaging (am)
312-880-7980
Report
Ameritech Illinois
312-525-8824
Report
Mcimetro Access Transmission Services LLC
312-274-1527
Report
Ameritech Illinois
312-117-8241
Report
UNKNOWN
312-846-7764
Report
Ameritech Illinois

Most searched numbers

Cell
All TimeThis Month
312-385-5877First seen 2016-06-02312-845-4609First seen 2014-09-24
312-678-7960First seen 2017-09-30312-466-1996First seen 2012-08-15
312-256-6975First seen 2011-08-26312-801-8253First seen 2020-06-13
312-943-5871First seen 2016-09-28312-328-5771First seen 2018-10-24
312-149-4860First seen 2014-08-06312-848-3353First seen 2017-05-29
Landline
All TimeThis Month
312-928-2835First seen 2015-04-24312-251-4306First seen 2014-05-11
312-885-6527First seen 2015-12-18312-734-6400First seen 2015-12-13
312-216-7059First seen 2012-10-06312-346-1253First seen 2019-07-12
312-916-1169First seen 2017-10-11312-709-2167First seen 2017-11-12
312-464-7699First seen 2016-01-05312-712-7113First seen 2013-08-16

Cities With coverage

CITY LIST
Chicago
Hinsdale
La Grange Park
Northbrook
Roselle
Wheeling