United States - Resident Population in the Mountain Census Division was 25270.22500 Thous. of Persons in January of 2021, according to the United States Federal Reserve. Historically, United States - Resident Population in the Mountain Census Division reached a record high of 25270.22500 in January of 2021 and a record low of 1684.00000 in January of 1900. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Resident Population in the Mountain Census Division - last updated from the United States Federal Reserve on April of 2024.