what area code is 240
Area code 240 is an area code that covers Western Maryland, specifically the part of Maryland that is included in the Washington DC metro area. Area code 240 overlays the area code of 301.Maryland has area codes of 227, 240, 301, 410, 443, 667.rea code map of the entire U.S. The USA.com website and domain are privately owned and are not operated by or affiliated with any government or municipal authority. Â© 2015 World Media Group, LLC.