 From that point forward, the population continued to grow steadily, representing an almost 300% increase through the 2010 Census.In 1991, the Virginia Landmarks Register designated approximately in the county's western portion as the Madison-Barbour Rural Historic District.The largest such district in the Commonwealth includes James Madison's Montpelier, James Barbour's Thomas Jefferson-designed Barboursville mansion (now in ruins), several plantations, portions of the Monticello Viticultural Area, as well as numerous individual sites listed on the National Register.