Resident Population in Kearny County, KS was 3.80800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Kearny County, KS reached a record high of 4.52100 in January of 1999 and a record low of 3.00000 in January of 1972. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Kearny County, KS - last updated from the United States Federal Reserve on April of 2026.