Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Ada County, ID was 411348.00000 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 Ada County, ID reached a record high of 411348.00000 in January of 2022 and a record low of 322652.00000 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 Ada County, ID - last updated from the United States Federal Reserve on June of 2024.