Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in New Castle County, DE was 311658.00000 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 New Castle County, DE reached a record high of 343102.00000 in January of 2009 and a record low of 311658.00000 in January of 2022. 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 New Castle County, DE - last updated from the United States Federal Reserve on May of 2024.