Resident Population in Marion County, TX was 9.57100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Marion County, TX reached a record high of 11.00800 in January of 2001 and a record low of 8.00000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Marion County, TX - last updated from the United States Federal Reserve on May of 2024.