List of Maryland area codes

File:Area code 410.png

The blue area is assigned area codes 301, 240, and 227; the red area is area codes 410, 443 and 667

The state of Maryland is served by the following area codes:

Area codes	Numbering plan area
227 240 301	western Maryland, including its suburbs of Washington, D.C.
410 443 667	eastern Maryland including Baltimore and Annapolis