Directory of U.S. area codes and international country calling codes.
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directory of U.S. area codes by state plus cities within each area code. Also lists Canadian area codes by province or territory.
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search by area code, state abbreviation, or city name.
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features code lists, maps, and news to help you keep up with all the changes.
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Area code lookup with maps by state or by code.
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zip code and area code lookup and conversion database.
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Information about North American area codes, featuring changes and historical data.
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information about the original area codes from 1947, their evolution to the current state, and future developments including area code splits and overlays. Also features area code maps.
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Neutral, third party administrator that works with the telecommunications industry in developing area code relief plans.
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features government links for each state.
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