Rensselaer
- County:
- Jasper County
- County Seat:
- Yes
- Area (mi²):
- 7.149
- State:
- Indiana
Rensselaer is a city located in Jasper County, Indiana. Rensselaer has a 2026 population of 5,632. It is also the county seat of Jasper County. Rensselaer is currently declining at a rate of -0.79% annually and its population has decreased by -1.5% since the most recent census, which recorded a population of 5,718 in 2020.