Resident Population in Martin County, IN was 9.89700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Martin County, IN reached a record high of 11.40000 in January of 1971 and a record low of 9.79900 in January of 2021. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Martin County, IN - last updated from the United States Federal Reserve on May of 2024.