Located in the Eastern (GMT -05:00) time zone. Area code 959 serves the state of Connecticut. This area code was assigned on October 4th, 1999. On August 30th, 2014 it went into service. 959 is a General Purpose Code. 959 service area does overlap with 860 area codes. Dialing pattern for local calls within the same NPA (area code) is 10D.