Prefix 312-452 — Chicago Zone 01, IL
- Area code
- 312
- Prefix (NXX)
- 452
- Rate center
- Chicago Zone 01
- State
- Illinois
- Time zone
- Central
- Code holder
- ONVOY SPECTRUM, LLC
- OCN
- 624H
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2025-09-02
- LATA
- 358
A phone number starting 312-452 was issued in the Chicago Zone 01 rate center of IL — part of area code 312.
Code-holder of record: ONVOY SPECTRUM, LLC (OCN 624H), assigned September 2, 2025. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 312-452 numbers may be served by different companies.
A scammer can display 312-452 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 |
|---|---|---|
| 312-449 | Chicago Zone 01 | WAVENATION, LLC |
| 312-450 | Chicago Zone 01 | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 312-451 | Chicago Zone 01 | T-MOBILE USA, INC. |
| 312-453 | Chicago Zone 01 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL |
| 312-454 | Chicago Zone 01 | ILLINOIS BELL TEL CO |
| 312-455 | Chicago Zone 01 | ILLINOIS BELL TEL CO |
FAQ
Where is 312-452 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 312-452 numbers?
ONVOY SPECTRUM, 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 312-452 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.