Resident Population in Smith County, KS was 3.59000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Smith County, KS reached a record high of 6.75700 in January of 1970 and a record low of 3.53300 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Smith County, KS - last updated from the United States Federal Reserve on May of 2024.