Area Code +1-406-(4410000...4419999) located in Helena, Montana (MT), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 406 Subscriber Number From : 4410000 Subscriber Number To : 4419999 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 : QWEST CORPORATION 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 : MT Region Name : Montana City : Helena Timezone : America/Denver Coordinated Universal Time : -07:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 46.6000 Longitude : -112.0200 ‹ previous : +1-406-(4400000...4409999) next › : +1-406-(4420000...4429999) Dialling Instructions For trunk calls: 0 406 4410000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 406 4410000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4410000 ~ 4419999 (Count: 10,000) Example: +1-406-4410000 / 0111-406-4410000 (1406-4410000 / 1-406-4410000) +1-406-4410001 / 0111-406-4410001 (1406-4410001 / 1-406-4410001) +1-406-4410002 / 0111-406-4410002 (1406-4410002 / 1-406-4410002) +1-406-4410003 / 0111-406-4410003 (1406-4410003 / 1-406-4410003) +1-406-4410004 / 0111-406-4410004 (1406-4410004 / 1-406-4410004) ...+1-406-xxxxxxx / 0111-406-xxxxxxx (1406-xxxxxxx / 1-406-xxxxxxx) ...+1-406-4419995 / 0111-406-4419995 (1406-4419995 / 1-406-4419995) +1-406-4419996 / 0111-406-4419996 (1406-4419996 / 1-406-4419996) +1-406-4419997 / 0111-406-4419997 (1406-4419997 / 1-406-4419997) +1-406-4419998 / 0111-406-4419998 (1406-4419998 / 1-406-4419998) +1-406-4419999 / 0111-406-4419999 (1406-4419999 / 1-406-4419999)