The Town of Westfield is located in Sauk County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 35.8 square miles (92.6 km2), of which, 35.8 square miles (92.6 km2) of it is land and 0.03% is water.

As of the census[2] of 2000, there were 611 people, 202 households, and 171 families residing in the town.

There were 216 housing units at an average density of 6.0 per square mile (2.3/km2).

11.4% of all households were made up of individuals, and 4.5% had someone living alone who was 65 years of age or older.