Resident Population in Johnson County, IN was 167.81900 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Johnson County, IN reached a record high of 167.81900 in January of 2023 and a record low of 61.13800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Johnson County, IN - last updated from the United States Federal Reserve on May of 2024.