Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 414 [Rate centres in NPA 414] [Dial plan for NPA 414]

NXX: 370

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
414-370 A Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 0 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 1 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 2 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 3 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 4 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 5 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 6 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 7 Milwaukee Zone 1 WI MILWWIAUX7Y  939H COMMIO, LLC 356   2024-05-09   
414-370 8 Milwaukee Zone 1 WI MILWWI12XTX  624H ONVOY SPECTRUM, LLC 356   2024-05-10   
414-370 9 Milwaukee Zone 1 WI MILWWI12XTX  624H ONVOY SPECTRUM, LLC 356   2024-05-10   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.