Resident Population in Johnson County, WY was 8.75900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Johnson County, WY reached a record high of 8.75900 in January of 2023 and a record low of 5.40000 in January of 1972. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Johnson County, WY - last updated from the United States Federal Reserve on May of 2024.