Resident Population in Louisa County, IA was 10.51300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Louisa County, IA reached a record high of 12.17800 in January of 2002 and a record low of 10.51300 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Louisa County, IA - last updated from the United States Federal Reserve on May of 2024.