Prefix 414-439 — Milwaukee Zone 1, WI
- Area code
- 414
- Prefix (NXX)
- 439
- Rate center
- Milwaukee Zone 1
- State
- Wisconsin
- Time zone
- Central
- Code holder
- T-MOBILE USA, INC.
- OCN
- 6529
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2014-03-17
- LATA
- 356
The 414-439 prefix belongs to area code 414 and is anchored to the Milwaukee Zone 1 rate center (WI). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.
Milwaukee Zone 1 is part of the Milwaukee-Waukesha, WI Metropolitan Statistical Area. For routing purposes it sits in LATA 356. Numbers here keep Central time.
The assigned code holder is T-MOBILE USA, INC., operating company number 6529, assigned March 17, 2014. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
Caller ID showing 414-439 is not proof the call came from Milwaukee Zone 1: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 414-436 | Milwaukee Zone 1 | ONVOY, LLC - WI |
| 414-437 | Milwaukee Zone 5 | EON TELECOM, INC. |
| 414-438 | Milwaukee Zone 1 | WISCONSIN BELL INC |
| 414-440 | Milwaukee Zone 1 | AMERICAN MESSAGING SERVICES, LLC |
| 414-441 | Milwaukee Zone 3 | ONVOY, LLC - WI |
| 414-442 | Milwaukee Zone 1 | WISCONSIN BELL INC |
FAQ
Where is 414-439 located?
The prefix is assigned to the Milwaukee Zone 1 rate center in WI, area code 414. It is part of the Milwaukee-Waukesha, WI Metropolitan Statistical Area.
Which company owns 414-439 numbers?
T-MOBILE USA, INC. 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 414-439 safe to answer?
The prefix itself says nothing about the caller. Legitimate Milwaukee Zone 1 businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.