Area code 959 is found in the US state of Connecticut. Area code 860 is a telephone area code, overlaid by area code 959, that covers most of Connecticut, except its southwest, which uses area codes 203 and 475. Area code 959 was originally announced in August 1999, to overlay area code 860 when the 860 code was nearing exhaustion, starting in August 2014. Area code 959 was first put in service August 30, 2014. Currently, the largest city it serves is Hartford, CT, and it overlaps coverage areas with area code 860. Phone numbers in the 959 area code can be found in 8 cities or locations.