Area Code +1-240-(5451000...5451999) located in Upper Marlboro, Maryland (MD), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 240 Subscriber Number From : 5451000 Subscriber Number To : 5451999 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 : US LEC OF 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 : Upper 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 : +1-240-(5450000...5450999) next › : +1-240-(5452000...5452999) Dialling Instructions For trunk calls: 0 240 5451000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 240 5451000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 5451000 ~ 5451999 (Count: 1,000) Example: +1-240-5451000 / 0111-240-5451000 (1240-5451000 / 1-240-5451000) +1-240-5451001 / 0111-240-5451001 (1240-5451001 / 1-240-5451001) +1-240-5451002 / 0111-240-5451002 (1240-5451002 / 1-240-5451002) +1-240-5451003 / 0111-240-5451003 (1240-5451003 / 1-240-5451003) +1-240-5451004 / 0111-240-5451004 (1240-5451004 / 1-240-5451004) ...+1-240-xxxxxxx / 0111-240-xxxxxxx (1240-xxxxxxx / 1-240-xxxxxxx) ...+1-240-5451995 / 0111-240-5451995 (1240-5451995 / 1-240-5451995) +1-240-5451996 / 0111-240-5451996 (1240-5451996 / 1-240-5451996) +1-240-5451997 / 0111-240-5451997 (1240-5451997 / 1-240-5451997) +1-240-5451998 / 0111-240-5451998 (1240-5451998 / 1-240-5451998) +1-240-5451999 / 0111-240-5451999 (1240-5451999 / 1-240-5451999)