Area Code +1-307-(4390000...4390999) located in Casper, Wyoming (WY), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 307 Subscriber Number From : 4390000 Subscriber Number To : 4390999 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 : ADVANCED COMM - WY 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 : WY Region Name : Wyoming City : Casper Timezone : America/Denver Coordinated Universal Time : -07:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 42.8600 Longitude : -106.3200 ‹ previous : +1-307-(4389000...4389999) next › : +1-307-(4391000...4391999) Dialling Instructions For trunk calls: 0 307 4390000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 307 4390000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 4390000 ~ 4390999 (Count: 1,000) Example: +1-307-4390000 / 0111-307-4390000 (1307-4390000 / 1-307-4390000) +1-307-4390001 / 0111-307-4390001 (1307-4390001 / 1-307-4390001) +1-307-4390002 / 0111-307-4390002 (1307-4390002 / 1-307-4390002) +1-307-4390003 / 0111-307-4390003 (1307-4390003 / 1-307-4390003) +1-307-4390004 / 0111-307-4390004 (1307-4390004 / 1-307-4390004) ...+1-307-xxxxxxx / 0111-307-xxxxxxx (1307-xxxxxxx / 1-307-xxxxxxx) ...+1-307-4390995 / 0111-307-4390995 (1307-4390995 / 1-307-4390995) +1-307-4390996 / 0111-307-4390996 (1307-4390996 / 1-307-4390996) +1-307-4390997 / 0111-307-4390997 (1307-4390997 / 1-307-4390997) +1-307-4390998 / 0111-307-4390998 (1307-4390998 / 1-307-4390998) +1-307-4390999 / 0111-307-4390999 (1307-4390999 / 1-307-4390999)