Area Code +1-301-(3580000...3580999) located in Marlboro, Maryland (MD), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 301 Subscriber Number From : 3580000 Subscriber Number To : 3580999 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 : LEVEL 3 COMM - MD 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 : MD Region Name : Maryland City : Marlboro Timezone : America/New_York Coordinated Universal Time : -05:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 38.8200 Longitude : -76.7500 ‹ previous : +1-301-(3579000...3579999) next › : +1-301-(3581000...3581999) Dialling Instructions For trunk calls: 0 301 3580000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 301 3580000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3580000 ~ 3580999 (Count: 1,000) Example: +1-301-3580000 / 0111-301-3580000 (1301-3580000 / 1-301-3580000) +1-301-3580001 / 0111-301-3580001 (1301-3580001 / 1-301-3580001) +1-301-3580002 / 0111-301-3580002 (1301-3580002 / 1-301-3580002) +1-301-3580003 / 0111-301-3580003 (1301-3580003 / 1-301-3580003) +1-301-3580004 / 0111-301-3580004 (1301-3580004 / 1-301-3580004) ...+1-301-xxxxxxx / 0111-301-xxxxxxx (1301-xxxxxxx / 1-301-xxxxxxx) ...+1-301-3580995 / 0111-301-3580995 (1301-3580995 / 1-301-3580995) +1-301-3580996 / 0111-301-3580996 (1301-3580996 / 1-301-3580996) +1-301-3580997 / 0111-301-3580997 (1301-3580997 / 1-301-3580997) +1-301-3580998 / 0111-301-3580998 (1301-3580998 / 1-301-3580998) +1-301-3580999 / 0111-301-3580999 (1301-3580999 / 1-301-3580999)