Prefix 414-366 — Milwaukee Zone 1, WI
- Area code
- 414
- Prefix (NXX)
- 366
- Rate center
- Milwaukee Zone 1
- State
- Wisconsin
- Time zone
- Central
- Code holder
- T-MOBILE USA, INC.
- OCN
- 6529
- Pooled
- Yes (thousands-block pooling)
- Assigned
- 2011-02-25
- LATA
- 356
414-366 identifies a block of numbers in Milwaukee Zone 1, WI, within the 414 area code. Every US prefix is tied to exactly one rate center; this one is Milwaukee Zone 1.
The rate center lies in the Milwaukee-Waukesha, WI Metropolitan Statistical Area. The serving LATA is 356. Local time follows the Central zone.
Treat the on-screen number as a hint, not evidence — 414-366 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
NANPA's central-office code records list T-MOBILE USA, INC. (OCN 6529) as the code holder, assigned February 25, 2011. Because 414-366 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 414-363 | Milwaukee Zone 3 | ONVOY, LLC - WI |
| 414-364 | Milwaukee Zone 4 | T-MOBILE USA, INC. |
| 414-365 | Milwaukee Zone 4 | WISCONSIN BELL INC |
| 414-367 | Milwaukee Zone 3 | LEVEL 3 TELECOM OF WISCONSIN, LP - WI |
| 414-368 | Milwaukee Zone 4 | LEVEL 3 TELECOM OF WISCONSIN, LP - WI |
| 414-369 | Milwaukee Zone 5 | LEVEL 3 TELECOM OF WISCONSIN, LP - WI |
FAQ
Where is 414-366 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 414-366 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 414-366 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.