Resident Population in Phelps County, MO was 45.28400 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Phelps County, MO reached a record high of 45.31300 in January of 2022 and a record low of 29.56700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Phelps County, MO - last updated from the United States Federal Reserve on May of 2024.