Resident Population in Shelby County, IA was 11.82100 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Shelby County, IA reached a record high of 15.80000 in January of 1972 and a record low of 11.47900 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Shelby County, IA - last updated from the United States Federal Reserve on April of 2026.