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312 Area Code 🌍☎️

Area Code Profile · Illinois

The 312 area code is located in the state of Illinois and covers 1 cities, serving a total population of approximately 2,695,598. Major cities covered by the 312 area code include Chicago (which represents the most populated areas). There are a total of 786 telephone prefix exchanges in this area code, which support an estimated 7,860,000 active or assignable phone numbers. These prefix lines are operated by 40 distinct carriers, with Chicago as the primary rate center location.

Central Time1 Cities786 Prefixes

Reverse Phone Lookup in Chicago, Illinois

Unmask unknown callers, verify telemarketing reports, and view detailed owner information for any phone number beginning with area code (312).

How it works

1

Enter Number

Provide any 10-digit phone number starting with the (312) area code.

2

Database Search

Our system scans public registries, carrier mappings, and spam reports.

3

Reveal Report

Access location details, line type, carrier, owner information, and safety levels.

Neighborhood Demographics

Calculated demographics and census summary estimations for area code 312.

38.4 y/oMedian Age
$116,400Median Income
$529,000Median Home Value
2,695,598Total Population

Telemarketer Complaints

Most recent complaints and comments for phone numbers beginning with 312.

Did you receive an unwanted call from a (312) phone number?

Help the community identify spammers by filing a comment.

(312) 680-6585May 20, 2026Scam / Fraud
Received a text and follow-up call saying my bank account was locked due to suspicious transactions. Included a link to a fake login portal. Do not click!
See Details
(312) 693-6602May 19, 2026Robocall
Robocall regarding health insurance plans. Said my current coverage was expiring and offered a "free consultation". Calling multiple times a day from slightly different numbers.
See Details
(312) 706-6619May 18, 2026Scam / Fraud
Robocall claiming to be from the IRS. Stated that my Social Security Number has been flagged and suspended. Asked to press 1 to speak with an agent. Obvious phishing scam.
See Details

Cities in the 312 Area Code

The most populous cities in area code 312 are: Chicago (2,695,598).

CityPopulation% in Area Code
Chicago2,695,5988%

What Time Zone is Area Code 312?

Central Time Zone

Abbreviation: CT · UTC Offset: UTC-6

The 312 area code lies within the Central Time Zone (CT, UTC-6).

Nearby Area Codes

217Springfield, Illinois224Elgin, Illinois309Peoria, Illinois331Aurora, Illinois447Springfield, Illinois464Cicero, Illinois618Belleville, Illinois630Aurora, Illinois708Cicero, Illinois730Belleville, Illinois

Phone Prefixes in the 312 Area Code

786 prefixes found · 40 carriers · 8 rate centers

PrefixCarrierRate Center
(312) 200METROPCS, INC.CHICGOZN01
(312) 201ILLINOIS BELL TEL COCHICGOZN01
(312) 202ILLINOIS BELL TEL COCHICGOZN01
(312) 203NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 204ILLINOIS BELL TEL COCHICGOZN01
(312) 205MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 206NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 207ILLINOIS BELL TEL COCHICGOZN01
(312) 208NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 209CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILNORTHBROOK
(312) 210PEERLESS NETWORK OF ILLINOIS, LLC - ILCHICGOZN01
(312) 212ILLINOIS BELL TEL COCHICGOZN01
(312) 213NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 214ILLINOIS BELL TEL COCHICGOZN01
(312) 215NEW CINGULAR WIRELESS PCS, LLC - ILWHEELING
(312) 216FIRST COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 217T-MOBILE USA, INC.CHICGOZN01
(312) 218NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 219BANDWIDTH.COM CLEC, LLC - ILCHICGOZN01
(312) 220ILLINOIS BELL TEL COCHICGOZN01
(312) 221T-MOBILE USA, INC.CHICGOZN01
(312) 222ILLINOIS BELL TEL COCHICGOZN01
(312) 223ILLINOIS BELL TEL COCHICGOZN01
(312) 224LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 225ILLINOIS BELL TEL COCHICGOZN01
(312) 226ILLINOIS BELL TEL COCHICGOZN01
(312) 227ILLINOIS BELL TEL COCHICGOZN01
(312) 228ILLINOIS BELL TEL COCHICGOZN01
(312) 229ILLINOIS BELL TEL COCHICGOZN01
(312) 230ILLINOIS BELL TEL COCHICGOZN01
(312) 231NEW CINGULAR WIRELESS PCS, LLC - ILROSELLE
(312) 232AMERICAN MESSAGING SERVICES, LLCCHICGOZN01
(312) 233ILLINOIS BELL TEL COCHICGOZN01
(312) 234ILLINOIS BELL TEL COCHICGOZN01
(312) 235ILLINOIS BELL TEL COCHICGOZN01
(312) 236ILLINOIS BELL TEL COCHICGOZN01
(312) 237CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILCHICGOZN01
(312) 238LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 239AT&T - LOCALCHICGOZN01
(312) 240ILLINOIS BELL TEL COCHICGOZN01
(312) 241NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 242TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01
(312) 243ILLINOIS BELL TEL COCHICGOZN01
(312) 244ILLINOIS BELL TEL COCHICGOZN01
(312) 245ILLINOIS BELL TEL COCHICGOZN01
(312) 246NEW CINGULAR WIRELESS PCS, LLC - ILWHEELING
(312) 247FIRST COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 248METROPCS, INC.CHICGOZN01
(312) 249USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 250USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 251ILLINOIS BELL TEL COCHICGOZN01
(312) 252MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 253MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 254MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 255ILLINOIS BELL TEL COCHICGOZN01
(312) 256MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 257CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILCHICGOZN01
(312) 258ILLINOIS BELL TEL COCHICGOZN01
(312) 259NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 260MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 261LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 262MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 263ILLINOIS BELL TEL COCHICGOZN01
(312) 264LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 265ACCESS ONE, INC. - ILCHICGOZN01
(312) 266ILLINOIS BELL TEL COCHICGOZN01
(312) 267ILLINOIS BELL TEL COCHICGOZN01
(312) 268LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 269ILLINOIS BELL TEL COCHICGOZN01
(312) 270METROPCS, INC.CHICGOZN01
(312) 271USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 272USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 273CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ILCHICGOZN01
(312) 274ILLINOIS BELL TEL COCHICGOZN01
(312) 275MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 276MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 277MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 278LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01
(312) 279MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 280ILLINOIS BELL TEL COCHICGOZN01
(312) 281GLOBAL CROSSING LOCAL SERVICES, INC. - ILCHICGOZN01
(312) 282NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 283GLOBAL CROSSING LOCAL SERVICES, INC. - ILCHICGOZN01
(312) 284XO ILLINOIS, INC.CHICGOZN01
(312) 285T-MOBILE USA, INC.CHICGOZN01
(312) 286NEW CINGULAR WIRELESS PCS, LLC - ILCHICGOZN01
(312) 287T-MOBILE USA, INC.CHICGOZN07
(312) 288MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01
(312) 289USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 290USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 291ILLINOIS BELL TEL COCHICGOZN01
(312) 292BANDWIDTH.COM CLEC, LLC - ILCHICGOZN01
(312) 293ILLINOIS BELL TEL COCHICGOZN01
(312) 294ILLINOIS BELL TEL COCHICGOZN01
(312) 295USA MOBILITY WIRELESS, INC.LA GRANGE
(312) 296T-MOBILE USA, INC.CHICGOZN01
(312) 297ILLINOIS BELL TEL COCHICGOZN01
(312) 298RCN TELECOM SERVICES OF ILLINIOS, INC. - ILCHICGOZN01
(312) 299USA MOBILITY WIRELESS, INC.CHICGOZN01
(312) 300LEVEL 3 COMMUNICATIONS, LLC - ILCHICGOZN01

Showing first 100 of 786 prefixes.

Frequently Asked Questions

Where is area code 312?
Area code 312 is located in Illinois, covering cities including Chicago.
What time zone is area code 312?
Area code 312 is in the Central Time Zone (CT, UTC-6).
What state is area code 312?
Area code 312 is in Illinois.