Frederick County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 78,305. Its county seat is Winchester. The county was formed in 1743 by the splitting of Orange County. It is Virginia's northernmost county.
The area that would become Frederick County, Virginia was inhabited and transited by various indigenous peoples for thousands of years before European colonization. The "Indian Road" refers to a historic pathway made by local tribes.
Frederick County was established in 1743 from parts of Orange County. (At that time, "Old Frederick County" encompassed all or part of four counties in present-day Virginia — Shenandoah, Clarke, Warren, and Frederick — and five in present-day West Virginia — Hardy, Hampshire, Berkeley, Jefferson and Morgan.) The Virginia Assembly named the new county for Frederick Louis, Prince of Wales (1707–1751), the eldest son of King George II of Great Britain.
American Revolutionary War
Commander-in-Chief of the Colonial forces, General George Washington's headquarters were located in Winchester. Washington represented Frederick County in his first elective offices, having been elected to the House of Burgesses in 1758 and 1761. Daniel Morgan was another famous General during the American Revolutionary War, from (present day Clarke County).
War of 1812
American Civil War
The first constitution of West Virginia provided for Frederick County to be added to the new state if approved by a local election. Unlike those of neighboring Berkeley and Jefferson counties, Frederick County residents voted to remain in Virginia despite being occupied by the Union Army at the time.
Note: Winchester city, formed from Frederick County. Annexation after 1970 from Frederick (1970 population 4,786).
Links to 1885 maps of Frederick County may be found here: http://www.historicmapworks.com/Browse/United_States/Virginia/Page/1/