Resident Population in Llano County, TX was 23.16300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Llano County, TX reached a record high of 23.16300 in January of 2024 and a record low of 6.97900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Llano County, TX - last updated from the United States Federal Reserve on April of 2026.