area 860 zip code
From Wikipedia, the free encyclopedia. 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.rom Wikipedia, the free encyclopedia. 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.