Frederick County
Also known as Frederick County, Virginia, Frederick County, VA
county in Virginia, United States
Key facts
- Country
- United States
- State
- Virginia
- Named after
- Frederick, Prince of Wales
- Seat
- Winchester
- Largest town
- Stephens City
- Total
- 416 sq mi (1,080 km )
- Land
- 414 sq mi (1,070 km )
- Water
- 2 sq mi (5.2 km ) 0.5%
- Estimate 2025
- 99,955
- Density
- 221/sq mi (85.3/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional district
Article
39°13′N 78°16′W / 39.21°N 78.26°W / 39.21; -78.26
Frederick County is the northernmost county 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 splitting Orange 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.