
Rensselaer County
- State:
- New York
Rensselaer County's estimated 2025 population is 159,073 with a growth rate of -0.07% in the past year according to the most recent United States census data. Rensselaer County is the 22nd largest county in New York. The 2010 population was 159,342 and has seen a growth of -0.17% since that time.