Black Brook is a town in Polk County, Wisconsin, United States.

At the 2000 census there were 1,208 people, 419 households, and 326 families in the town.

The population density was 35.3 people per square mile (13.6/km2).

There were 448 housing units at an average density of 13.1 per square mile (5.1/km2).

[2] Of the 419 households 41.5% had children under the age of 18 living with them, 67.1% were married couples living together, 5.7% had a female householder with no husband present, and 22.0% were non-families.