Area Code 240 — Germantown, Maryland

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About Area Code 240

Region Code
240
City
Germantown
State
Maryland
Population
2,930,000
Largest City
Frederick
Neighboring Codes
  • 202 (Washington, District of Columbia)
  • 703/571 (Arlington, Virginia)
  • 410/443/667 (Baltimore, Maryland)
  • 717 (Harrisburg, Pennsylvania)
  • 304 (Charleston, West Virginia)
Time Zone
Eastern Time

Map of Area Code 240

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History & Cultural Notes

Area code 240 was introduced in 1997 as an all-services overlay to 301 after the earlier 410 split removed the Baltimore/Eastern Shore from 301 in 1991. The overlay brought ten-digit dialing to the Washington, D.C. suburbs and most of western and southern Maryland, including Germantown and the I‑270 technology corridor. To extend capacity, 227 joined the overlay in 2023, creating a multi-code complex serving Montgomery and adjacent suburban counties, plus western and southern Maryland.

In Germantown, numbering growth tracked rapid late-20th-century suburban development and the rise of the I‑270 life sciences and federal research ecosystem. Residents commute into D.C. and Bethesda–Rockville as well as within Montgomery County, while local identity blends planned town centers, county parks, and the nearby Agricultural Reserve. The presence of federal laboratories and contractors, along with immigrant-founded small businesses, shapes a diverse cultural and economic landscape.