Rensselaer is a city in Rensselaer County, New York, USA, located on the Hudson River, directly opposite Albany. As of the 2000 census, the city population was 7,761; in 1920, it was 10,832. The name is from Kiliaen Van Rensselaer, the original landowner of the region in New Netherland. Rensselaer apartments for rent comparison page shows most up to date rent information on Rensselaer apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.