The use of food stamps has soared in the D.C. region, but so has the cost of fraud, and Maryland now ranks second in the country in misappropriated food assistance funding. The number of people receiving food stamps in Maryland has more than doubled since 2007 to nearly 677,000 as of April, or about 11 percent of the state’s population, according to the U.S. Department of Agriculture. In Virginia, use grew by 75 percent — more than doubling in Fairfax County alone. In the District, two of every 10 residents now use food stamps, up by a third since before the recession.