Williamstown is a town in Orange County, Vermont, United States.

The population was 3,515 at the 2020 census,[3] making it the second largest municipality in the county.

As of the census[1] of 2000, there were 3,225 people, 1,248 households, and 889 families residing in the town.

There were 1,318 housing units at an average density of 32.8 per square mile (12.7/km2).

21.3% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.