Resident Population in Platte County, WY was 8.54600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Platte County, WY reached a record high of 11.97500 in January of 1980 and a record low of 6.48600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Platte County, WY - last updated from the United States Federal Reserve on May of 2024.