Resident Population in Lafayette County, WI was 17.30600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Lafayette County, WI reached a record high of 17.90000 in January of 1976 and a record low of 15.77800 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lafayette County, WI - last updated from the United States Federal Reserve on April of 2026.