Area Code +1-301-(2963000...2963999) located in Rockville, 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 : 2963000 Subscriber Number To : 2963999 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 : MCI WORLDCOM 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 : Rockville Timezone : America/New_York Coordinated Universal Time : -05:00 Daylight Saving Time : Yes National Significant Number Minimum Length : 10 Latitude : 39.0900 Longitude : -77.1600 ‹ previous : +1-301-(2962000...2962999) next › : +1-301-(2964000...2964999) Dialling Instructions For trunk calls: 0 301 2963000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 301 2963000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 2963000 ~ 2963999 (Count: 1,000) Example: +1-301-2963000 / 0111-301-2963000 (1301-2963000 / 1-301-2963000) +1-301-2963001 / 0111-301-2963001 (1301-2963001 / 1-301-2963001) +1-301-2963002 / 0111-301-2963002 (1301-2963002 / 1-301-2963002) +1-301-2963003 / 0111-301-2963003 (1301-2963003 / 1-301-2963003) +1-301-2963004 / 0111-301-2963004 (1301-2963004 / 1-301-2963004) ...+1-301-xxxxxxx / 0111-301-xxxxxxx (1301-xxxxxxx / 1-301-xxxxxxx) ...+1-301-2963995 / 0111-301-2963995 (1301-2963995 / 1-301-2963995) +1-301-2963996 / 0111-301-2963996 (1301-2963996 / 1-301-2963996) +1-301-2963997 / 0111-301-2963997 (1301-2963997 / 1-301-2963997) +1-301-2963998 / 0111-301-2963998 (1301-2963998 / 1-301-2963998) +1-301-2963999 / 0111-301-2963999 (1301-2963999 / 1-301-2963999)