List of Maryland area codes

The state of Maryland is served in two geographically distinct numbering plan areas in the North American Numbering Plan (NANP), which are each served with three overlay area codes.

Area
code		 Year
created		 Parent
NPA		 Overlay Numbering plan area
301 1947 – 227/240/301 Western Maryland, including its suburbs of Washington, D.C.
240 1997 301
227 2023 240/301
410 1991 301 410/443/667 Eastern Maryland including Baltimore and Annapolis
443 1997 410
667 2012 410/443
This article is issued from Wikipedia. The text is available under Creative Commons Attribution-Share Alike 4.0 unless otherwise noted. Additional terms may apply for the media files.