Resident Population in Rockwall County, TX was 140.73800 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Rockwall County, TX reached a record high of 140.73800 in January of 2025 and a record low of 7.04600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Rockwall County, TX - last updated from the United States Federal Reserve on June of 2026.