Located in the Eastern (GMT -05:00) time zone. Area code 947 serves the state of Michigan. This area code was assigned on September 2nd, 1999. On September 7th, 2002 it went into service. 947 is a General Purpose Code. 947 service area does overlap with 248 area codes. Dialing pattern for local calls within the same NPA (area code) is 10D.