Area codes 715 and 534
Area codes 715 and 534 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Wisconsin. The numbering plan area (NPA) comprises most of the northern part of the state. 715 was one of the original North American area codes created in 1947, while 534 was added in 2010 as an additional code for the same numbering plan area to form an overlay plan. History. When the first nationwide telephone numbering plan was created in 1947, Wisconsin was divided into two NPAs. The northern part received area code 715 , while the rest was assigned area code 414. Due to northern Wisconsin's low population density, 715 was for a long time one of the few original area codes never to have been split or overlaid. But by 2010, the proliferation of cellphones and pagers had almost exhausted 715's telephone numbers. Central office code relief was implemented by adding area code 534 to form an overlay that summer.