Resident Population in Harper County, KS was 5.43500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Harper County, KS reached a record high of 7.87100 in January of 1970 and a record low of 5.32300 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Harper County, KS - last updated from the United States Federal Reserve on May of 2024.