Area Code Time Zone Database

Includes Daylight Savings Info

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.

*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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Based on frequency of change, we recommend you download the latest version of this particular database on a regular basis.

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Area Code Database

The benefits and usage of this telecom database file varies greatly by company and application. For instance, telemarketing companies use it to comply with the FTC’s designated call times. This telco data is great for telephony applications and for general telecom data verification. We believe you will find it to be the most accurate Area Code Database available. Learn more: View Area Code Data product documentation / Watch our Accuracy Matters video

Database Specs

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.


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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Related Links

Area Codes by ZIP Code
Area Code Data with Time Zones, Rate Center
Area Code Data with Time Zones, Rate Center, Operating Company