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 |
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