Area code 534 is found in the US state of Wisconsin. Area codes 715 and 534. North American telephone area codes 715 and 534 are state of Wisconsin area codes covering most of the northern part of the state. The main area code, 715, was created along with Area code 414 as one of the two original area codes assigned to Wisconsin in October 1947. Phone numbers in the 534 area code can be found in 5 cities or locations.