According to the United States Census Bureau, the village has a total area of 0.6 square miles (1.6 km²), of which, 0.6 square miles (1.5 km²) of it is land and 0.04 square miles (0.1 km²) of it (3.28%) is water.
There were 113 households out of which 29.2% had children under the age of 18 living with them, 47.8% were married couples living together, 13.3% had a female householder with no husband present, and 32.7% were non-families. 24.8% of all households were made up of individuals and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.53 and the average family size was 3.07.
In the village the population was spread out with 26.6% under the age of 18, 10.1% from 18 to 24, 26.6% from 25 to 44, 21.7% from 45 to 64, and 15.0% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.9 males. For every 100 females age 18 and over, there were 94.4 males.
The median income for a household in the village was $29,464, and the median income for a family was $37,500. Males had a median income of $26,932 versus $16,607 for females. The per capita income for the village was $13,005. About 1.4% of families and 10.7% of the population were below the poverty line, including 11.1% of those under the age of eighteen and 18.4% of those sixty five or over.
Warrens is also home to one of the Jellystone Park campgrounds in Wisconsin. The campground has not only camping, but rentable villas, a resort the "Three Bears Lodge", and an indoor water park. An expansion is planned for a championship golf course and convention center.