Resident Population in Thomas County, KS was 7.86500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Thomas County, KS reached a record high of 8.82700 in January of 1983 and a record low of 7.35300 in January of 2008. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Thomas County, KS - last updated from the United States Federal Reserve on May of 2024.