Prefix 312-517 — Chicago Zone 01, IL
- Area code
- 312
- Prefix (NXX)
- 517
- Rate center
- Chicago Zone 01
- State
- Illinois
- Time zone
- Central
- Code holder
- MCIMETRO ACCESS TRANSMISSION SERVICES LLC
- OCN
- 7229
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2015-02-09
- LATA
- 358
A phone number starting 312-517 was issued in the Chicago Zone 01 rate center of IL — part of area code 312.
NANPA's central-office code records list MCIMETRO ACCESS TRANSMISSION SERVICES LLC (OCN 7229) as the code holder, assigned February 9, 2015. Because 312-517 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
A scammer can display 312-517 without ever touching IL. When in doubt, end the call and reach the company or agency through its official website; unwanted robocalls belong in the FTC's fraud report queue.
Chicago Zone 01 is part of the Chicago-Naperville-Elgin, IL-IN Metropolitan Statistical Area. For routing purposes it sits in LATA 358. Numbers here keep Central time.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 312-514 | Chicago Zone 01 | AMERICAN MESSAGING SERVICES, LLC |
| 312-515 | Chicago Zone 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 312-516 | Chicago Zone 01 | ILLINOIS BELL TEL CO |
| 312-518 | Wheeling | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 312-519 | Chicago Zone 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
| 312-520 | Chicago Zone 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
FAQ
Where is 312-517 located?
The prefix is assigned to the Chicago Zone 01 rate center in IL, area code 312. It is part of the Chicago-Naperville-Elgin, IL-IN Metropolitan Statistical Area.
Which company owns 312-517 numbers?
MCIMETRO ACCESS TRANSMISSION SERVICES LLC holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 312-517 safe to answer?
The prefix itself says nothing about the caller. Legitimate Chicago Zone 01 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.