The area code 227 is located in Silver Spring, Maryland.
Area code 227 serves Silver Spring, Maryland, as part of an overlay with the long-standing 301 and 240 area codes. Located just north of Washington, D.C., Silver Spring is a major hub in Montgomery County, known for Downtown Silver Spring, the AFI Silver Theatre, and nearby federal campuses like the FDA in White Oak. The 227 overlay was introduced in 2023 to ensure enough phone numbers for the region’s growth, and it covers the same footprint as 240/301. This includes busy suburbs, historic towns, and key corridors that connect to the nation’s capital.
Area code 227 covers Silver Spring and nearby communities across central, western, and southern Maryland, including parts of Montgomery and Prince George’s counties. Major cities and areas within the 227/240/301 overlay include:
Established as an overlay, 227 does not replace existing numbers; new lines may receive 227 while current numbers keep their area code. Ten-digit dialing is standard across the region, reflecting long-running practices in the Washington, D.C. metro. As NANPA noted, “Area code 227 will overlay the existing 240/301 numbering plan area” (North American Numbering Plan Administrator, 2023). With area code 227 in Silver Spring, callers can expect the same service area that includes major employers, transit links like the Red Line and Purple Line corridor, and a mix of residential, tech, and federal offices.