Resident Population in Osceola County, IA was 5.97800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Osceola County, IA reached a record high of 8.60000 in January of 1973 and a record low of 5.96100 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Osceola County, IA - last updated from the United States Federal Reserve on May of 2024.