Where is phone area code 704 located?

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Houston has four area codes, so why is 713 so special?

It's part of our community identity now—the 336 area code. And like everything else it has a history! Area codes in North Carolina only go back to 1947. Back in the middle of the 20th century, 704 covered the whole state. Then in 1954, part of the state was split off into 919. That lasted for decades. But eventually the numbers started to run out, a problem that accelerated with the dawn of the cellular age. In 1993, Winston-Salem was part of the state that got swept into a 910 area code. And th