The 240 area code covers Maryland's entire portion of the greater Washington, D.C. area. It does not cover the largest cities that are associated with Maryland and the adjacent areas: Baltimore and Washington, DC. The 240 area code was created in 1997.

The largest cities in the 240 Area Code are:

The 240 area code is largely composed of residential communities, most of which could be considered suburbs of Washington, D.C. As a result, it is home to many people who work in the District of Columbia, and the surrounding area. Because of the large number of private and public-sector jobs in Washington, DC, including branch offices of several international law firms, as well as many government agencies that employ attorneys, there are many lawyers who live and work in and around the 240 area code, but only a few that are LegalMatch Family Lawyers or that know the ins and outs of Federal Employment Law.

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LegalMatch provides an extensive list of lawyers in various Maryland cities.