Resident Population in Miami County, KS was 35.32000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Miami County, KS reached a record high of 35.32000 in January of 2023 and a record low of 19.25400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Miami County, KS - last updated from the United States Federal Reserve on May of 2024.