NALENND™
United States NPA NXX to Zip Code Database

The NALENND™ database is built using GIS data layers to accurately determine service area by Zip Code and accurately maps United States telephone area codes and exchanges to 5-digit ZIP Codes.

NALENND NPA NXX Database This cross-reference is based on the geography of the NPA NXX Rate Center and the ZIP Code boundaries which yields a true representation of the coverage areas.

NPA NXX numbering resources are assigned by Rate Centers. Rate Centers are the regulated geographic service areas that telecom carriers provide service to and because their boundaries are relatively stable it is possible to compare them to USPS postal carrier routes to determine what NPA NXX combinations are used in specific Zip Codes.

Produced: on or before 5th calendar day monthly
Current Release: March 2, 2017
Distribution Frequency: monthly or quarterly (issue date: January, April, July, October)
Distribution Format: Internet download


United States NPA NXX to ZIP Code Editions

 FIPS EditionStandard Edition
NPA (Area Code)YesYes
NXX (Exchange)YesYes
Zip CodeYesYes
StateYesYes
USPS City NameYesYes
FIPS County CodeYesNo
FIPS Place CodeYesNo
Rate CenterYesYes
Major Trading AreaYesNo