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NPA NXX to Zip Code Database


Produced: on or before 5th calendar day monthly
Current Release: October 5, 2016
Distribution Frequency: monthly or quarterly (issue date: January, April, July, October)
Distribution Format: Internet download

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.

This mapping 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.

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 FIPS EditionStandard Edition
NPA (Area Code)YesYes
NXX (Exchange)YesYes
Zip CodeYesYes
USPS City NameYesYes
FIPS County CodeYesNo
FIPS Place CodeYesNo
Rate CenterYesYes
Major Trading AreaYesNo
 FIPS EditionStandard Edition
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Corporate License - Annual subscription - monthly updates

These products are delivered in common zip format. They are created with WinZip file compression utility using legacy compression for maximum portability.

Our raw data files are UTF-8, comma separated value (CSV) text files with no Byte Order Mark (BOM) signature. Each row is terminated with a carriage return line feed character pair. Each data field is separated with a single comma character. If the field data contains one or more commas then the field is encapsulated with an opening and closing double quote character.

Each file name ends with the file extension ".txt" or ".csv" and can be easily viewed with any text editor. On the Microsoft Windows platform the ".csv" file extension is generally associated with tools such as Microsoft Excel. While this is generally not a problem these files are typically too large for Excel and will often fail to load with an Excel file not loaded completely error.