Resident Population in Lyon County, KS was 32.52000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Lyon County, KS reached a record high of 37.61700 in January of 1984 and a record low of 31.99400 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lyon County, KS - last updated from the United States Federal Reserve on April of 2026.