Area Code Time Zone Database

Our Area Code Database is a telco data product which provides a list of all active area codes and prefixes (NPA/NXX)*. It includes highly accurate Time Zones and Daylight Saving Time information in an area code database.

telecom data This telco database product is updated regularly as codes are added and is released monthly. The price includes an initial download and any updates made available throughout your subscription period.

*NPA/NXX - NPA is a telecom data code which stands for Numbering Plan Area. It is just the telephone area code. The NXX stands for Exchange or Central Office Code. It is often referred to as an area code prefix.



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Database Specs & Features

Download Sample Data (CSV)

  • Immediate Download

    Download is available immediately upon purchase and for the duration of the annual subscription.

  • Monthly Updates

    We update our database monthly and recommend that you download monthly as well.

  • Free FTP/SFTP (upon request)

    To update your database without human intervention, we can provide an FTP address for you to write a script to access. Just request it after purchase.

  • Data Format - CSV

    Comma-Separated Values (CSV) Text File


  • Area Code

    All standard telco data area codes are listed in our area code database, except toll-free area codes such as 800, 866, 877 and other specialty area codes are not included. The first digit is in the range of 2-9, the second digit can be a 0-8, and the third digit can be a 0-9.

  • Prefix

    The prefix (also called the Exchange or Central Office Code) is next. This is referred to as the ‘NXX’. The first digit is in the range of 2-9, the second and third digits can be a 0-9.

  • State Abbreviation

    This is the 2-character standard (U.S. Postal Service) state abbreviation. We also include a file called, ‘states.txt’ which will list the state name for each abbreviation.

  • Time Zone

    U.S. Time Zones are in a standard format which is the number of hours from Coordinated Universal Time (UTC) which was formerly called Greenwich Mean Time (GMT). Greenwich is where the Royal Observatory is located (Southeast London). West of UTC is negative and so all records have negative numbers. The zones range from -5 (Eastern Standard Time) to -10 (Hawaiian Standard Time).

  • Daylight Savings Flag

    If the area covered by this area code / prefix observes Daylight Saving Time, then the last field will be ‘Y’, otherwise ‘N.’

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