Resident Population in Clay County, IN was 26.46000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Clay County, IN reached a record high of 26.86300 in January of 2010 and a record low of 23.93300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clay County, IN - last updated from the United States Federal Reserve on May of 2024.