Area Code 240  is assigned to the following locations in: Maryland

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1. Aspen Hill
2. Bethesda
3. Bowie
4. Brunswick
5. College Park
6. Cumberland
7. Frederick
8. Gaithersburg
9. Golden Beach
10. Greenbelt
11. Hagerstown
12. Hyattsville
13. Laurel
14. Lexington Park
15. Montgomery Village
16. New Carrollton
17. Potomac
18. Rockville
19. St. Charles
20. St. Marys City
21. Silver Spring
22. Wheaton
23. suburbs of D.C.
24. (301/240 overlay)
    

This completes the Area Code Finder list of telephone area codes in the major cities assigned to the 240 Area Code

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