Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Jefferson County, CO was 444084.00000 Persons in January of 2022, according to the United States Federal Reserve. Historically, Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Jefferson County, CO reached a record high of 449495.00000 in January of 2020 and a record low of 425357.00000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Jefferson County, CO - last updated from the United States Federal Reserve on May of 2024.