Resident Population in Phillips County, KS was 4.76100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Phillips County, KS reached a record high of 8.10000 in January of 1975 and a record low of 4.76100 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Phillips County, KS - last updated from the United States Federal Reserve on May of 2024.