Area Code Rate Center Database

npa nxx rate center This Area Code Time Zone database provides a list of all active area codes with time zone information, prefixes (NPA/NXX)* and Rate Center Names (a Rate Center is how the telecom industry identifies an exchange's service area). It includes highly accurate Time Zones and Daylight Saving Time information.

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

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Database Specs & Features

Download Sample Data (CSV)

  • Immediate Download

    Download is available immediately upon purchase of this npa nxx rate center database 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 area codes are listed. 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.

  • Rate Center Names

    This version includes an intuitive rate center name. Industry rate center names are limited to 10 characters therefore are heavily abbreviated and cryptic. We’ve translated as many as possible into a more meaningful label (35 characters), plus we use upper and lower case the names. This is ideal for using in telephony or call accounting reports.

  • 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

    This area codes time zone info is 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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