Milwaukee Zone 4, WI — rate center
The Milwaukee Zone 4 rate center (Wisconsin) anchors 45 active prefixes under area code 414. Rate centers, not city limits, are what phone numbers are legally tied to.
NANPA records show 45 active prefixes here across 13 carriers. 29 prefixes participate in thousands-block pooling, so blocks of 1,000 numbers are shared between carriers.
The rate center belongs to the Milwaukee-Waukesha, WI Metropolitan Statistical Area. Routing-wise it sits in LATA 356.
As always with US numbering: a prefix anchored to Milwaukee Zone 4 tells you where the block was issued. The person calling may have ported the number, moved away, or be spoofing it entirely — verify callers through independently found contact details.
Prefixes anchored to Milwaukee Zone 4
| Prefix | Code holder | Pooled |
|---|---|---|
| 414-206 | T-MOBILE USA, INC. | Yes |
| 414-214 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Yes |
| 414-228 | WISCONSIN BELL INC | No |
| 414-236 | T-MOBILE USA, INC. | Yes |
| 414-247 | WISCONSIN BELL INC | No |
| 414-262 | T-MOBILE USA, INC. | Yes |
| 414-284 | STRATUS NETWORKS | Yes |
| 414-348 | FRACTEL, LLC | Yes |
| 414-351 | WISCONSIN BELL INC | No |
| 414-352 | WISCONSIN BELL INC | No |
| 414-353 | WISCONSIN BELL INC | No |
| 414-354 | WISCONSIN BELL INC | No |
| 414-355 | WISCONSIN BELL INC | No |
| 414-357 | WISCONSIN BELL INC | No |
| 414-358 | WISCONSIN BELL INC | No |
| 414-359 | WISCONSIN BELL INC | No |
| 414-362 | WISCONSIN BELL INC | No |
| 414-364 | T-MOBILE USA, INC. | No |
| 414-365 | WISCONSIN BELL INC | No |
| 414-368 | LEVEL 3 TELECOM OF WISCONSIN, LP - WI | Yes |
| 414-371 | WISCONSIN BELL INC | No |
| 414-375 | LEVEL 3 COMMUNICATIONS, LLC - WI | Yes |
| 414-381 | T-MOBILE USA, INC. | Yes |
| 414-392 | ONVOY, LLC - WI | Yes |
| 414-410 | TELEPORT COMMUNICATIONS AMERICA, LLC WI | Yes |
| 414-420 | ONVOY, LLC - WI | Yes |
| 414-434 | PAETEC ITEL, LLC | Yes |
| 414-446 | T-MOBILE USA, INC. | Yes |
| 414-450 | EON TELECOM, INC. | Yes |
| 414-540 | WISCONSIN BELL INC | Yes |
| 414-577 | WISCONSIN BELL INC | No |
| 414-586 | WISCONSIN BELL INC | Yes |
| 414-600 | ONVOY, LLC - WI | Yes |
| 414-622 | BANDWIDTH.COM CLEC, LLC - WI | Yes |
| 414-716 | PAETEC ITEL, LLC | Yes |
| 414-742 | TON80 COMMUNICATIONS, LLC | Yes |
| 414-751 | LEVEL 3 COMMUNICATIONS, LLC - WI | Yes |
| 414-760 | WISCONSIN BELL INC | No |
| 414-786 | FRACTEL, LLC | Yes |
| 414-797 | T-MOBILE USA, INC. | Yes |
| 414-815 | WISCONSIN BELL INC | Yes |
| 414-865 | T-MOBILE USA, INC. | Yes |
| 414-928 | T-MOBILE USA, INC. | Yes |
| 414-973 | TELEPORT COMMUNICATIONS AMERICA, LLC WI | Yes |
| 414-979 | WISCONSIN BELL INC | Yes |
FAQ
What area code is Milwaukee Zone 4, WI?
Milwaukee Zone 4 numbers use area code 414.
How many prefixes does Milwaukee Zone 4 have?
45 active NXX prefixes are anchored to this rate center in NANPA records, held by 13 carriers.
Is a call from a Milwaukee Zone 4 prefix really from Milwaukee Zone 4?
Not necessarily. The prefix marks where the number block was issued; porting, VoIP and spoofing all detach calls from that geography.