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- Your Ad Here Tompkins County is a county located in the U.S. state of New York. As of the 2000 census, the population was 96,501. The county seat is Ithaca. History Tompkins County was created in 1817. The name is in honor of Daniel D. Tompkins, who served as Governor of New York and Vice President of the United States of America. ![]() |