Where Code - Area Code Location Databases
If you need the city for area codes and exchanges (NPA+NXX), this is the product for you. It's as simple as possible, with just the area code, exchange, city, and state. We include information on all active exchanges in the United States (over 150,000 exchanges in all). The file is in the universal CSV format (which all databases can import, and is easy to manipulate using custom programs). We update the database about once a week (it was last updated 14 Sep 2011 -- less than 445 days ago), so there is no need to worry that the data is out-of-date.
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