Resident Population in Trempealeau County, WI was 30.89900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Trempealeau County, WI reached a record high of 30.89900 in January of 2022 and a record low of 23.30000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Trempealeau County, WI - last updated from the United States Federal Reserve on May of 2024.