Resident Population in Martin County, MN was 19.65700 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Martin County, MN reached a record high of 25.30000 in January of 1972 and a record low of 19.64100 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Martin County, MN - last updated from the United States Federal Reserve on May of 2024.