Inc.'s first annual ranking of America's top businesses in the Washington Metropolitan region is here. The area's fastest growing private companies--representing Maryland, Virginia, Delaware, and the District of Columbia--saw their combined two-year total revenues grow 106 percent to a collective $6.5 billion in 2018. They also added more than 41,000 jobs over the term. Their 2018 revenue, alone, ranged from $1 million to $458 million.