MainStreet Bancshares, Inc. operates as the bank holding company for MainStreet Bank that provides various banking products and services for individuals, small to medium-sized businesses, and professional service organizations primarily in Northern Virginia and the greater Washington, the District of Columbia metropolitan area. The company offers demand, NOW, money market, savings, and sweep accounts, as well as certificates of deposit; business and consumer checking, interest-bearing checking, business account analysis, and other depository services; and cash management, wire transfer, check imaging, remote deposit capture, and courier services. It also provides commercial loans, including government contract receivables, plant and equipment, general working capital, contract administration, and acquisition loans; commercial real estate, real estate construction, and residential real estate loans; and consumer loans comprising car loans, term loans, credit cards, and overdraft protection. In addition, the company provides payment service and deposit insurance solutions; remote deposit of checks; and internet bill payment, online cash management, and online and mobile banking services. It operates through a network of seven branches located in Herndon, Fairfax, Fairfax City, McLean, Clarendon, and Leesburg, Virginia, and one branch in Washington, the District of Columbia; and provides automated teller machine transaction services at approximately 55,000 locations in the United States, Canada, the United Kingdom, and Mexico. MainStreet Bancshares, Inc. was incorporated in 2003 and is headquartered in Fairfax, Virginia.