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312-503

You are reviewing the Area Code (NPA/NXX) report for 312-503. Did you mean to search the SMS short code 312503?

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🇺🇸 DSN NORTHCOM Area Code Detected

The area code you entered, 312, overlaps with the DSN network for the Continental United States and Puerto Rico under Northern Command (NORTHCOM), though it could also be part of standard civilian phone numbers.

Raw Number312503
Basic Format312-503
NPA (Area Code)312
NXX503

Call Routing Data

NPA-NXX-XOCNCompanyRate CenterUse TypeCityStateRegion
312-503-0XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-1XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-2XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-3XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-4XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-5XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-6XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-7XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-8XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-9XXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-503-XXXX7136TELEPORT COMMUNICATIONS AMERICA, LLC - ILCHICGOZN01ASCHICAGO ZONE 01IL

Business/Government Phones on the 312-503 Prefix

PhoneNameAddress
312-503-3573Harry’s Cafe357 East Chicago Avenue Chicago 60611 US

Reports

Anonymous User from , IL

March 26, 2026 at 2:26 PM

312-503-0255 reported as a Live Voice or Other. Received on March 7, 2026 at 10:51 AM.

Anonymous User from , IL

June 12, 2025 at 5:22 PM

312-503-2624 reported as a Robocall. Received on June 10, 2025 at 3:04 PM.

Anonymous User from Chicago, IL

June 10, 2025 at 6:51 PM

312-503-4485 reported as a Prerecorded Voice. Received on June 10, 2025 at 11:46 AM.
Unwanted call for unknown
Contacted via Wired

Anonymous User from , IL

March 12, 2025 at 4:20 PM

312-503-8578 reported as a Robocall. Received on March 12, 2025 at 3:14 PM.
Call for Medical & prescriptions

Anonymous User from Sandwich, Illinois

September 15, 2024 at 1:59 PM

312-503-0979 reported as a Robocall. Received on September 3, 2024 at 3:51 PM.

Anonymous User from Sandwich, Illinois

November 12, 2023 at 6:36 AM

312-503-3463 reported as a Robocall. Received on November 10, 2023 at 4:10 PM.

Anonymous User from , IL

January 18, 2023 at 4:29 PM

312-503-5368 reported as a unwanted call. Received on January 18, 2023 at 3:20 PM.
Call for No Subject Provided

Anonymous User from Oak Forest, Illinois

August 6, 2022 at 11:41 AM

312-503-1397 reported as a Robocall. Received on August 5, 2022 at 11:25 AM.
Call for Calls pretending to be government, businesses, or family and friends

Anonymous User from , IL

July 13, 2022 at 7:43 PM

312-503-7924 reported as a Robocall. Received on July 7, 2022 at 12:00 AM.

Anonymous User from , IL

July 13, 2022 at 7:42 PM

312-503-7924 reported as a Robocall. Received on July 7, 2022 at 12:00 AM.

Most 'popular' numbers on this prefix:

312-503-0XXX: 312-503-0000 | 312-503-0001 | 312-503-0002 | 312-503-0090 | 312-503-0091 | 312-503-0099 | 312-503-0222 | 312-503-0226 | 312-503-0238 | 312-503-0247 | 312-503-0248 | 312-503-0300 | 312-503-0302 | 312-503-0303 | 312-503-0370 | 312-503-0377 | 312-503-0500 | 312-503-0502 | 312-503-0503 | 312-503-0506 | 312-503-0600 | 312-503-0601 | 312-503-0602 | 312-503-0698 | 312-503-0699 | 312-503-0700 | 312-503-0702 | 312-503-0706 | 312-503-0707 | 312-503-0902 | 312-503-0903 | 312-503-0907 | 312-503-0990 | 312-503-0997 | 312-503-0998 |
312-503-1XXX: 312-503-1300 | 312-503-1302 | 312-503-1308 | 312-503-1395 | 312-503-1398 | 312-503-1399 | 312-503-1400 | 312-503-1409 | 312-503-1414 | 312-503-1491 | 312-503-1495 | 312-503-1499 | 312-503-1600 | 312-503-1608 | 312-503-1640 | 312-503-1641 | 312-503-1647 | 312-503-1688 |
312-503-2XXX: 312-503-2500 | 312-503-2501 | 312-503-2507 | 312-503-2508 | 312-503-2930 | 312-503-2931 | 312-503-2933 | 312-503-2992 | 312-503-2998 | 312-503-2999 |
312-503-3XXX: 312-503-3140 | 312-503-3142 | 312-503-3145 | 312-503-3196 | 312-503-3443 | 312-503-3452 | 312-503-3456 | 312-503-3460 | 312-503-3465 | 312-503-3469 | 312-503-3500 | 312-503-3501 | 312-503-3570 | 312-503-3575 | 312-503-3577 | 312-503-3800 | 312-503-3840 | 312-503-3845 | 312-503-3847 | 312-503-3900 | 312-503-3906 | 312-503-3910 | 312-503-3911 | 312-503-3915 | 312-503-3998 |
312-503-4XXX: 312-503-4241 | 312-503-4242 | 312-503-4243 | 312-503-4260 | 312-503-4262 | 312-503-4269 | 312-503-4310 | 312-503-4315 | 312-503-4317 | 312-503-4400 | 312-503-4409 | 312-503-4444 | 312-503-4480 | 312-503-4487 | 312-503-4488 | 312-503-4600 | 312-503-4662 | 312-503-4666 | 312-503-4667 |
312-503-5XXX: 312-503-5200 | 312-503-5270 | 312-503-5277 | 312-503-5300 | 312-503-5360 | 312-503-5365 | 312-503-5366 | 312-503-5407 | 312-503-5408 | 312-503-5409 | 312-503-5460 | 312-503-5465 | 312-503-5630 | 312-503-5631 | 312-503-5637 | 312-503-5706 | 312-503-5707 | 312-503-5750 | 312-503-5755 | 312-503-5757 |
312-503-6XXX: 312-503-6001 | 312-503-6004 | 312-503-6008 | 312-503-6080 | 312-503-6083 | 312-503-6088 |
312-503-7XXX: 312-503-7920 | 312-503-7921 | 312-503-7923 | 312-503-7995 | 312-503-7997 | 312-503-7998 |
312-503-8XXX: 312-503-8122 | 312-503-8125 | 312-503-8126 | 312-503-8187 | 312-503-8188 | 312-503-8197 | 312-503-8243 | 312-503-8245 | 312-503-8247 | 312-503-8258 | 312-503-8282 | 312-503-8283 | 312-503-8404 | 312-503-8408 | 312-503-8430 | 312-503-8434 | 312-503-8435 | 312-503-8453 | 312-503-8500 | 312-503-8501 | 312-503-8507 | 312-503-8556 | 312-503-8600 | 312-503-8601 | 312-503-8606 | 312-503-8640 | 312-503-8645 | 312-503-8648 |