Resident Population in Miami County, IN was 35.61300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Miami County, IN reached a record high of 40.90000 in January of 1974 and a record low of 33.40100 in January of 1995. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Miami County, IN - last updated from the United States Federal Reserve on April of 2026.