Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Plymouth County, IA was 451.00000 Persons in January of 2022, according to the United States Federal Reserve. Historically, Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Plymouth County, IA reached a record high of 451.00000 in January of 2022 and a record low of 36.00000 in January of 2012. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Plymouth County, IA - last updated from the United States Federal Reserve on May of 2024.