Resident Population in Linn County, IA was 228.97200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Linn County, IA reached a record high of 230.41100 in January of 2020 and a record low of 163.21300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Linn County, IA - last updated from the United States Federal Reserve on May of 2024.