Located in the Central (GMT -06:00) time zone. Area code 847 serves the state of Illinois. This area code was assigned on July 27th, 1995. On January 20th, 1996 it went into service. 847 is a General Purpose Code. 847 service area does overlap with 224 area codes. Dialing pattern for local calls within the same NPA (area code) is 1+10D.