Resident Population in Montgomery County, KS was 30.56800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Montgomery County, KS reached a record high of 43.28600 in January of 1982 and a record low of 30.56800 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Montgomery County, KS - last updated from the United States Federal Reserve on May of 2024.