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Area codes 713, 281, 832, 346, and 621 are telephone area code in the North American Numbering Plan (NANP) forming an overlay complex for Houston, Texas, and its environs. Area code 713 is one of the original four area codes established for Texas in 1947.
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area houston code 713 texas numbering codes 281 plan north american overlay 2013 832 346 621 telephone original four established
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