Area Code +1-301-(2978000...2978999) located in Clinton, 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 : 2978000 Subscriber Number To : 2978999 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 : VERIZON MARYLAND INC 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 : Clinton Timezone : America/New_York Coordinated Universal Time : -05:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 38.7700 Longitude : -76.9000 ‹ previous : +1-301-(2977000...2977999) next › : +1-301-(2979000...2979999) Dialling Instructions For trunk calls: 0 301 2978000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 301 2978000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 2978000 ~ 2978999 (Count: 1,000) Example: +1-301-2978000 / 0111-301-2978000 (1301-2978000 / 1-301-2978000) +1-301-2978001 / 0111-301-2978001 (1301-2978001 / 1-301-2978001) +1-301-2978002 / 0111-301-2978002 (1301-2978002 / 1-301-2978002) +1-301-2978003 / 0111-301-2978003 (1301-2978003 / 1-301-2978003) +1-301-2978004 / 0111-301-2978004 (1301-2978004 / 1-301-2978004) ...+1-301-xxxxxxx / 0111-301-xxxxxxx (1301-xxxxxxx / 1-301-xxxxxxx) ...+1-301-2978995 / 0111-301-2978995 (1301-2978995 / 1-301-2978995) +1-301-2978996 / 0111-301-2978996 (1301-2978996 / 1-301-2978996) +1-301-2978997 / 0111-301-2978997 (1301-2978997 / 1-301-2978997) +1-301-2978998 / 0111-301-2978998 (1301-2978998 / 1-301-2978998) +1-301-2978999 / 0111-301-2978999 (1301-2978999 / 1-301-2978999)