Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Marion County, IA was 31424.00000 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 Marion County, IA reached a record high of 31980.00000 in January of 2010 and a record low of 31293.00000 in January of 2020. 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 Marion County, IA - last updated from the United States Federal Reserve on May of 2024.