Resident Population in Sumner County, KS was 22.33400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Sumner County, KS reached a record high of 26.18300 in January of 1998 and a record low of 22.33400 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Sumner County, KS - last updated from the United States Federal Reserve on May of 2024.