The hydroelectric Prairie du Sac Dam was completed just north of the village in 1914, creating Lake Wisconsin.

As of the census[4] of 2010, there were 3,972 people, 1,649 households, and 1,075 families living in the village.

28.6% of all households were made up of individuals, and 12.8% had someone living alone who was 65 years of age or older.

25.5% of all households were made up of individuals, and 10.6% had someone living alone who was 65 years of age or older.

Sauk City is adjacent to Prairie du Sac, directly to the south.

Both communities are located on the west bank of the Wisconsin River.

Efforts have been made to join the two villages into a single entity, Sauk Prairie, but these have failed, due to differences in taxation.

The corporate headquarters of Culver's Franchising Systems, Inc. is located in Prairie du Sac.

The first Culver's restaurant opened in the adjacent village of Sauk City on July 18, 1984.

The corporate headquarters of Badgerland Financial and Mueller Sports Medicine are also in Prairie du Sac.