Area Code +1-301-(3378000...3378999) located in Gaithersburg, 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 : 3378000 Subscriber Number To : 3378999 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 : BANDWIDTH.COM - 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 : Gaithersburg Timezone : America/New_York Coordinated Universal Time : -05:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 39.1400 Longitude : -77.2000 ‹ previous : +1-301-(3377000...3377999) next › : +1-301-(3379000...3379999) Dialling Instructions For trunk calls: 0 301 3378000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 301 3378000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3378000 ~ 3378999 (Count: 1,000) Example: +1-301-3378000 / 0111-301-3378000 (1301-3378000 / 1-301-3378000) +1-301-3378001 / 0111-301-3378001 (1301-3378001 / 1-301-3378001) +1-301-3378002 / 0111-301-3378002 (1301-3378002 / 1-301-3378002) +1-301-3378003 / 0111-301-3378003 (1301-3378003 / 1-301-3378003) +1-301-3378004 / 0111-301-3378004 (1301-3378004 / 1-301-3378004) ...+1-301-xxxxxxx / 0111-301-xxxxxxx (1301-xxxxxxx / 1-301-xxxxxxx) ...+1-301-3378995 / 0111-301-3378995 (1301-3378995 / 1-301-3378995) +1-301-3378996 / 0111-301-3378996 (1301-3378996 / 1-301-3378996) +1-301-3378997 / 0111-301-3378997 (1301-3378997 / 1-301-3378997) +1-301-3378998 / 0111-301-3378998 (1301-3378998 / 1-301-3378998) +1-301-3378999 / 0111-301-3378999 (1301-3378999 / 1-301-3378999)