Resident Population in Fremont County, WY was 39.81500 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Fremont County, WY reached a record high of 41.02900 in January of 2012 and a record low of 28.35200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Fremont County, WY - last updated from the United States Federal Reserve on May of 2024.