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Area codes for all of the United States, Canada and the Caribbean with information about overlays and splits. Look up by state or area code.

AreaCode.org lists US and Canada telephone area codes for reverse area code lookup. Find area code list, area code maps, and cities within an area code.

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Lists U.S. and Canada area codes, the state the area code belongs to, and the time zone of all area codes starting with 2.

Locator for telephone area codes in the USA, Canada and some Caribbean Islands; lookup cities in an area code and viceversa - detailed information on all codes including map and time zone/curent time

Zip Codes, Postal Codes, and Zip Code Maps for USA, Canada, and Mexico

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ZIPboundary.com provides ZIP Code map layers in Shapefile (SHP) and other formnats for companies with their own GIS (geographic information) systems. 888-732-5446.