Resident Population in Utah County, UT was 759.85900 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Utah County, UT reached a record high of 759.85900 in January of 2025 and a record low of 137.77600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Utah County, UT - last updated from the United States Federal Reserve on May of 2026.