Northfield is a town in Washington County, Vermont, United States. The town lies in a valley within the Green Mountains and has been home to Norwich University since 1866. It contains the village of Northfield, where over half of the population lives. The town's total population was 5,918 at the 2020 census.

Washington County is a county located in the U.S. state of Vermont. Named after George Washington, its shire town is the city of Montpelier and the most populous municipality is the city of Barre. As of the 2020 census, the population was 59,807, making it the third-most populous county in Vermont, but the third-least populous capital county in the United States after Hughes County, South Dakota and Franklin County, Kentucky. Washington County comprises the Barre, Vermont micropolitan statistical area. In 2010, the center of population of Vermont was located in Washington County, in the town of Warren.