Prairie du Sac
- County:
- Columbia County
- County Seat:
- No
- Area (mi²):
- 1.993
- State:
- Wisconsin
Prairie du Sac is a village located in Columbia County, Wisconsin. Prairie du Sac has a 2026 population of 4,358. Prairie du Sac is currently declining at a rate of -0.27% annually and its population has decreased by -1.47% since the most recent census, which recorded a population of 4,423 in 2020.