Located in the Central (GMT -06:00) time zone. Area code 534 serves the state of Wisconsin. This area code was assigned on November 6th, 2008. On August 14th, 2010 it went into service. 534 is a General Purpose Code. 534 service area does overlap with 715 area codes. Dialing pattern for local calls within the same NPA (area code) is 10D.