Resident Population in Buffalo County, WI was 13.46400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Buffalo County, WI reached a record high of 14.60000 in January of 1977 and a record low of 13.01200 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Buffalo County, WI - last updated from the United States Federal Reserve on April of 2026.