Area Code +1-203-(7770000...7779999) located in New Haven, Connecticut (CT), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 203 Subscriber Number From : 7770000 Subscriber Number To : 7779999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : G (Geographic Land Line, Fixed Line) Carrier Name : FRONTIER COMM - CT Click here to buy United States Area Code Database Other Information Language Code : en (English) Country Number : 840 (United States) Country Code : US (United States) Region Code : CT Region Name : Connecticut City : New Haven Timezone : America/New_York Coordinated Universal Time : -05:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 41.3000 Longitude : -72.9300 ‹ previous : +1-203-(7760000...7769999) next › : +1-203-(7780000...7789999) Dialling Instructions For trunk calls: 0 203 7770000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 203 7770000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 7770000 ~ 7779999 (Count: 10,000) Example: +1-203-7770000 / 0111-203-7770000 (1203-7770000 / 1-203-7770000) +1-203-7770001 / 0111-203-7770001 (1203-7770001 / 1-203-7770001) +1-203-7770002 / 0111-203-7770002 (1203-7770002 / 1-203-7770002) +1-203-7770003 / 0111-203-7770003 (1203-7770003 / 1-203-7770003) +1-203-7770004 / 0111-203-7770004 (1203-7770004 / 1-203-7770004) ...+1-203-xxxxxxx / 0111-203-xxxxxxx (1203-xxxxxxx / 1-203-xxxxxxx) ...+1-203-7779995 / 0111-203-7779995 (1203-7779995 / 1-203-7779995) +1-203-7779996 / 0111-203-7779996 (1203-7779996 / 1-203-7779996) +1-203-7779997 / 0111-203-7779997 (1203-7779997 / 1-203-7779997) +1-203-7779998 / 0111-203-7779998 (1203-7779998 / 1-203-7779998) +1-203-7779999 / 0111-203-7779999 (1203-7779999 / 1-203-7779999)