Keymar, Maryland Area Code
Keymar, MD is officially utilizing an area code overlay in which area codes 410, 443 and 667 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to Keymar, MD area code information read more about area codes 410, 443 and 667 details and Maryland area codes.
Keymar, MD is located in Frederick County and observes the Eastern Time Zone. View our Times by Area Code tool.