United States - Population, Total for Least Developed Countries was 1160824674.00000 Persons in January of 2023, according to the United States Federal Reserve. Historically, United States - Population, Total for Least Developed Countries reached a record high of 1160824674.00000 in January of 2023 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 2026.