De Witt County, TX - Resident Population in DeWitt County, TX was 19.92900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, De Witt County, TX - Resident Population in DeWitt County, TX reached a record high of 20.63200 in January of 2015 and a record low of 18.30000 in January of 1978. Trading Economics provides the current actual value, an historical data chart and related indicators for De Witt County, TX - Resident Population in DeWitt County, TX - last updated from the United States Federal Reserve on May of 2024.