Upper Marlboro, Maryland Area Code

Upper Marlboro, MD Area Codes are

301 and 240

Upper Marlboro, MD is officially utilizing an area code overlay in which area codes 240 and 301 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Upper Marlboro, MD area code information read more about area codes 240 and 301 details and Maryland area codes.

Upper Marlboro, MD is located in Prince Georges County and observes the Eastern Time Zone. View our Times by Area Code tool.

Maryland Area Code Map