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312-821

You are reviewing the Area Code (NPA/NXX) report for 312-821. Did you mean to search the SMS short code 312821?

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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 Number312821
Basic Format312-821
NPA (Area Code)312
NXX821

Call Routing Data

NPA-NXX-XOCNCompanyRate CenterUse TypeCityStateRegion
312-821-0XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-1XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-2XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-3XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-4XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-5XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-6XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-7XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-8XXX7229MCIMETRO ACCESS TRANSMISSION SERVICES LLCCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-9XXX7196MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ILCHICGOZN01RTCHICAGO ZONE 01ILMW
312-821-XXXX7196MCIMETRO ACCESS TRANSMISSION SERVICES LLC - ILCHICGOZN01ASCHICAGO ZONE 01IL

Business/Government Phones on the 312-821 Prefix

PhoneNameAddress
312-821-7972L.A. Fitness - Dr. MLK Jr. Drive
312-821-9020AMOpportunities, Inc.

Reports

Anonymous User from , IL

February 19, 2026 at 7:14 PM

312-821-0220 reported as a Robocall. Received on February 19, 2026 at 1:36 AM.

Anonymous User from Williamsport, Pennsylvania

February 19, 2026 at 4:47 PM

312-821-5514 reported as a Live Voice or Other. Received on February 19, 2026 at 4:43 PM.
Call for Calls pretending to be government, businesses, or family and friends

Anonymous User from , IL

July 17, 2025 at 11:22 AM

312-821-3407 reported as a Robocall. Received on July 10, 2025 at 1:57 PM.
Call for Dropped call or no message

Anonymous User from Illinois, Illinois

January 3, 2025 at 5:17 PM

312-821-5852 reported as a Robocall. Received on January 3, 2025 at 3:26 PM.

Anonymous User from Chicago, Illinois

April 3, 2023 at 12:37 PM

312-821-7181 reported as a Live Voice or Other. Received on April 3, 2023 at 11:06 AM.
Call for Dropped call or no message

Anonymous User from Downers Grove, Illinois

February 7, 2023 at 12:00 PM

312-821-3528 reported as a Robocall. Received on February 7, 2023 at 9:39 AM.
Call for Reducing your debt (credit cards, mortgage, student loans)

Anonymous User from St. Louis, Missouri

August 29, 2022 at 11:21 AM

312-821-0097 reported as a Live Voice or Other. Received on July 4, 2022 at 3:00 PM.
Call for Dropped call or no message

Anonymous User from San Jose, California

July 21, 2022 at 4:23 PM

312-821-0932 reported as a Robocall. Received on July 20, 2022 at 10:01 AM.
Call for Warranties & protection plans

Anonymous User from Naperville, Illinois

June 9, 2022 at 11:13 PM

312-821-4361 reported as a Robocall. Received on June 8, 2022 at 1:57 PM.
Call for Warranties & protection plans

Most 'popular' numbers on this prefix:

312-821-0XXX: 312-821-0010 | 312-821-0011 | 312-821-0020 | 312-821-0090 | 312-821-0093 | 312-821-0099 | 312-821-0900 | 312-821-0902 | 312-821-0907 | 312-821-0930 | 312-821-0937 |
312-821-1XXX: 312-821-1700 | 312-821-1730 | 312-821-1735 | 312-821-1738 | 312-821-1750 | 312-821-1800 | 312-821-1850 | 312-821-1890 | 312-821-1896 | 312-821-1898 |
312-821-3XXX: 312-821-3200 | 312-821-3220 | 312-821-3222 | 312-821-3231 | 312-821-3520 | 312-821-3521 | 312-821-3525 | 312-821-3800 | 312-821-3807 | 312-821-3808 | 312-821-3850 | 312-821-3888 |
312-821-4XXX: 312-821-4300 | 312-821-4333 | 312-821-4350 | 312-821-4360 | 312-821-4365 |
312-821-5XXX: 312-821-5820 | 312-821-5850 | 312-821-5855 |
312-821-7XXX: 312-821-7100 | 312-821-7105 | 312-821-7107 | 312-821-7180 | 312-821-7181 | 312-821-7188 | 312-821-7500 | 312-821-7505 | 312-821-7507 | 312-821-7550 | 312-821-7555 | 312-821-7900 | 312-821-7901 | 312-821-7938 | 312-821-7970 | 312-821-7975 | 312-821-7977 |
312-821-9XXX: 312-821-9000 | 312-821-9010 | 312-821-9020 | 312-821-9022 | 312-821-9024 |