240 Area Code: Germantown, Maryland

Maryland's 240 area code is an overlay covering the western and central parts of the state, sharing geography with the long-running 301. Germantown anchors the directory's records here. Germantown sits in Montgomery County along the I-270 corridor north of Washington, on a stretch of suburban country that has filled in steadily through the past several decades as the federal-employment economy of the broader DC region has pulled steadily on the surrounding counties. The 240 footprint reaches from the Chesapeake Bay's western shore across Frederick, Hagerstown, and the western Maryland panhandle to the West Virginia line.

Records linked to 240 numbers in the directory often include Baltimore — Maryland's largest city — despite Baltimore lying outside the 240 footprint to the east. The pattern reflects standard public-record dynamics, with phone numbers porting across Maryland and addresses linked across multiple cities. The directory currently documents 511 distinct prefixes within 240 in detail, a working subset of the prefix population the code carries.

Germantown's median household income runs well above the US figure, in line with the broader Montgomery County profile that combines federal employment, professional services, and a substantial higher-income residential base. Home values come in well above the national median, the city's median age sits close to the US reading, and population places Germantown as one of the larger census-designated places in Maryland. The 240 footprint shares those demographics with 301 because both codes serve the same broad western-and-central footprint in overlapping form.