Nxx Websites:

  • localcallingguide.com

    Local calling guide: Main

    Local calling guide

  • stuffsoftware.com

    NPA NXX - North American Telephone Database, Area Code,U.S. switching...

    Area Code,U.S. switching centers,NPA,NXX,Exchange,LATA,Telephone company,CLEC,CLLI Code, Number Portability,Vertical,Horizontal,Latitude Longitude, Mileage, NECA FCC Tariff #4,...