Resident Population in Tompkins County, NY was 103.55800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Tompkins County, NY reached a record high of 106.04400 in January of 2021 and a record low of 77.06400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Tompkins County, NY - last updated from the United States Federal Reserve on May of 2024.