Resident Population in Trinity County, TX was 14.22800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Trinity County, TX reached a record high of 14.72800 in January of 2010 and a record low of 7.62800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Trinity County, TX - last updated from the United States Federal Reserve on May of 2024.