Resident Population in King County, TX was 0.21700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in King County, TX reached a record high of 0.46400 in January of 1970 and a record low of 0.21700 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in King County, TX - last updated from the United States Federal Reserve on May of 2024.