Resident Population in Clay County, TX was 10.73000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Clay County, TX reached a record high of 11.32000 in January of 2005 and a record low of 7.20000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clay County, TX - last updated from the United States Federal Reserve on April of 2026.