Resident Population in Cortland County, NY was 45.94500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Cortland County, NY reached a record high of 49.58400 in January of 1993 and a record low of 45.80000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Cortland County, NY - last updated from the United States Federal Reserve on April of 2026.