Sudley is a census-designated place (CDP) in Prince William County, Virginia, United States.

Residents of Sudley are represented in the Virginia House of Delegates by Danica Roem.

[3] According to the United States Census Bureau, the CDP has a total area of 1.6 square miles (4.0 km2), all of it land.

There were 2,703 housing units at an average density of 1,729.9 per square mile (667.9/km2).

16.7% of all households were made up of individuals, and 2.6% had someone living alone who was 65 years of age or older.