240 Area Code Information

State: MD

Largest City in Area: SILVER SPRING

Where is Area Code 240? Area code (240) is in the state of MD. Below, are the major cities in the area code (240).

Major Cities in 240

  • SILVER SPRING, MD (170,781)
  • WASHINGTON, DC (136,922)
  • GAITHERSBURG, MD (125,213)
  • HYATTSVILLE, MD (115,832)
  • ROCKVILLE, MD (102,957)
  • LAUREL, MD (90,334)
  • GERMANTOWN, MD (80,333)
  • FREDERICK, MD (65,051)
  • UPPER MARLBORO, MD (65,041)
  • WALDORF, MD (60,608)

Zip Codes in 240

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