Frederick County is located in the Commonwealth of Virginia. As of the 2020 United States census, the population was 91,419. Its county seat is Winchester. The county was formed in 1743 by the splitting of Orange County. It is Virginia's northernmost county. Frederick County is included in the Winchester, VA-WV Metropolitan Statistical Area, which is als…Frederick County is located in the Commonwealth of Virginia. As of the 2020 United States census, the population was 91,419. Its county seat is Winchester. The county was formed in 1743 by the splitting of Orange County. It is Virginia's northernmost county. Frederick County is included in the Winchester, VA-WV Metropolitan Statistical Area, which is also included in the Washington-Baltimore-Northern Virginia, DC-MD-VA-WV-PA Combined Statistical Area.
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