Prefix 414-233 — Milwaukee Zone 1, WI

NANPA CO code assignment, current as of July 28, 2026.

Area code
414
Prefix (NXX)
233
Rate center
Milwaukee Zone 1
State
Wisconsin
Time zone
Central
Code holder
T-MOBILE USA, INC.
OCN
6529
Pooled
Yes (thousands-block pooling)
Assigned
2011-01-31
LATA
356

A phone number starting 414-233 was issued in the Milwaukee Zone 1 rate center of WI — part of area code 414.

NANPA's central-office code records list T-MOBILE USA, INC. (OCN 6529) as the code holder, assigned January 31, 2011. Because 414-233 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.

A scammer can display 414-233 without ever touching WI. 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.

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.

Neighboring prefixes

Prefixes adjacent to 414-233
PrefixRate centerCode holder
414-230 Milwaukee Zone 1 SPOK, INC.
414-231 Milwaukee Zone 1 WISCONSIN BELL INC
414-232 Milwaukee Zone 1 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI
414-234 Milwaukee Zone 5 T-MOBILE USA, INC.
414-235 Milwaukee Zone 3 T-MOBILE USA, INC.
414-236 Milwaukee Zone 4 T-MOBILE USA, INC.

FAQ

Where is 414-233 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 414-233 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 414-233 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.