United States - Population, Total for Least Developed Countries was 1057438163.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, United States - Population, Total for Least Developed Countries reached a record high of 1057438163.00000 in January of 2020 and a record low of 240518397.00000 in January of 1960. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Population, Total for Least Developed Countries - last updated from the United States Federal Reserve on April of 2024.