Resident Population in Marshall County, AL was 102.15600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Marshall County, AL reached a record high of 102.15600 in January of 2024 and a record low of 54.21100 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Marshall County, AL - last updated from the United States Federal Reserve on April of 2026.