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- Your Ad Here Rensselaer County is a county in the U.S. state of New York. As of the 2000 census, the population was 152,538. Its county seat is Troy. History Rensselaer County was created in 1792. Its name is in honor of the family of Kiliaen van Rensselaer, the original Dutch owner of the land in the area. ![]() |