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.

Switch: MDSNWI11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
608-250 A Madison WI 9327 WISCONSIN BELL INC 354      
608-251 A Madison WI 9327 WISCONSIN BELL INC 354      
608-252 A Madison WI 9327 WISCONSIN BELL INC 354      
608-255 A Madison WI 9327 WISCONSIN BELL INC 354      
608-256 A Madison WI 9327 WISCONSIN BELL INC 354      
608-257 A Madison WI 9327 WISCONSIN BELL INC 354      
608-258 A Madison WI 9327 WISCONSIN BELL INC 354      
608-259 A Madison WI 9327 WISCONSIN BELL INC 354      
608-260 A Madison WI 9327 WISCONSIN BELL INC 354      
608-280 A Madison WI 9327 WISCONSIN BELL INC 354      
608-281 A Madison WI 9327 WISCONSIN BELL INC 354      
608-283 A Madison WI 9327 WISCONSIN BELL INC 354      
608-284 A Madison WI 9327 WISCONSIN BELL INC 354      
608-286 A Madison WI 9327 WISCONSIN BELL INC 354      
608-287 A Madison WI 9327 WISCONSIN BELL INC 354      
608-294 A Madison WI 9327 WISCONSIN BELL INC 354      
608-395 A Madison WI 9327 WISCONSIN BELL INC 354      
608-957 A Madison WI 9327 WISCONSIN BELL INC 354      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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