Five Guys is a fast casual restaurant chain focused on hamburgers, hot dogs, and French fries, with its headquarters in the Lorton community in unincorporated Fairfax County, Virginia. The first Five Guys restaurant opened in 1986 in Arlington County, Virginia, and between 1986 and 2001, the chain expanded to five locations scattered through the Washington, D.C. metro area.In early 2003, the chain began franchising, opening the doors to rapid expansion.