Area code 336 is a NANPA area code which covers north-central North Carolina, mainly the Piedmont Triad region and the northern Foothills and northern Mountain regions.It was created out of area code 910 in 1997.he new area code will be used primarily for issuing new numbers. The new area code is needed because all available 336 numbers are expected to be used up by 2016, commission officials said. The Raleigh and Charlotte areas already have two overlay area codes.