The first detailed map of Loudoun County -- or of any part of the Virginia Piedmont or Northern Virginia -- was surveyed and drawn by Yardley Taylor in 1852-53. Taylor's 36-by-51-inch "Map of ...

Loudoun County, Virginia, has the highest median household ... at least two residents who are related to each other. The above map shows the counties in the lower 48 states shaded by median ...