Resident Population in Jay County, IN was 20.16400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Jay County, IN reached a record high of 24.40000 in January of 1975 and a record low of 20.06900 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Jay County, IN - last updated from the United States Federal Reserve on April of 2026.