Resident Population in Buena Vista County, IA was 20.56700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Buena Vista County, IA reached a record high of 21.20000 in January of 1972 and a record low of 19.48800 in January of 2007. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Buena Vista County, IA - last updated from the United States Federal Reserve on May of 2024.