Lookup › Area code 312
312 Area Code — Chicago, Illinois
Area code 312 serves Chicago, IL.
Most looked-up 312 numbers
- 312-473-9497
- 312-468-6837
- 312-462-4818
- 312-668-0188
- 312-554-5001
- 312-967-5881
- 312-426-1305
- 312-231-2486
- 312-771-9952
- 312-217-6498
- 312-200-8803
- 312-688-0188
Phone prefixes in 312
- 312-208
- 312-668
- 312-554
- 312-892
- 312-842
- 312-231
- 312-426
- 312-779
- 312-688
- 312-217
- 312-200
- 312-834
- 312-684
- 312-579
- 312-872
- 312-468
- 312-697
- 312-973
- 312-451
- 312-437
- 312-687
- 312-307
- 312-838
- 312-764
- 312-659
- 312-324
- 312-887
- 312-912
- 312-206
- 312-498
- 312-339
- 312-617
- 312-462
- 312-919
- 312-340
- 312-918
- 312-063
- 312-763
- 312-583
- 312-586
- 312-388
- 312-500
- 312-420
- 312-771
- 312-862
- 312-593
- 312-719
- 312-548
- 312-678
- 312-473
- 312-835
- 312-532
- 312-452
- 312-802
- 312-558
- 312-513
- 312-399
- 312-967
- 312-748
- 312-584
- 312-815
- 312-773
- 312-523
- 312-907
Carriers serving 312
- T-Mobile (23 numbers)
- At&t (11 numbers)
- Verizon (10 numbers)
- Onvoy, LLC (5 numbers)
- Bandwidth (4 numbers)
- USA Mobility Wireless, Inc. (3 numbers)
- Twilio (3 numbers)
- Level 3 Communications, LLC - (2 numbers)
- Teleport Communications Americ (1 numbers)
- American Messaging Services, L (1 numbers)
Frequently asked questions
Where is area code 312?
Area code 312 serves Chicago, IL.
What prefixes are in area code 312?
Phone2.io tracks 64 phone prefixes in area code 312, with carrier and spam-report data on individual numbers.
More about area code 312
Area code 312 overview, history, and local numbers · Get a IL phone number
Last updated: March 17, 2026