Resident Population in Upton County, TX was 3.12800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Upton County, TX reached a record high of 5.48700 in January of 1985 and a record low of 2.97900 in January of 2007. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Upton County, TX - last updated from the United States Federal Reserve on April of 2026.