Resident Population in Robertson County, TX was 17.65900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Robertson County, TX reached a record high of 17.65900 in January of 2024 and a record low of 14.38900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Robertson County, TX - last updated from the United States Federal Reserve on April of 2026.