Prefix 313-504 — Detroit Zone 03, MI
- Area code
- 313
- Prefix (NXX)
- 504
- Rate center
- Detroit Zone 03
- State
- Michigan
- Time zone
- Eastern
- Code holder
- ONVOY, LLCV - MI
- OCN
- 543C
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2021-11-24
- LATA
- 340
Numbers in the 313-504 prefix are registered to the Detroit Zone 03 rate center in MI, inside area code 313. The prefix is the second block of a ten-digit US number (313-504-XXXX) and pins the number to a billing locality.
The assigned code holder is ONVOY, LLCV - MI, operating company number 543C, assigned November 24, 2021. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
The rate center lies in the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area. The serving LATA is 340. Local time follows the Eastern zone.
Spoofing means this prefix on your screen doesn't guarantee a Detroit Zone 03 caller. Verify independently before trusting a request for money or data.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 313-501 | Detroit Zone 06 | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 313-502 | Detroit Zone 01 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC |
| 313-503 | Detroit Zone 05 | AMERICAN MESSAGING SERVICES, LLC |
| 313-505 | Detroit Zone 05 | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 313-506 | Detroit Zone 05 | NEW CINGULAR WIRELESS PCS, LLC - IL |
| 313-507 | Detroit Zone 05 | MICHIGAN BELL TEL CO |
FAQ
Where is 313-504 located?
The prefix is assigned to the Detroit Zone 03 rate center in MI, area code 313. It is part of the Detroit-Warren-Dearborn, MI Metropolitan Statistical Area.
Which company owns 313-504 numbers?
ONVOY, LLCV - MI 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 313-504 safe to answer?
The prefix itself says nothing about the caller. Legitimate Detroit Zone 03 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.