Resident Population in Clark County, IN was 127.47900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Clark County, IN reached a record high of 127.47900 in January of 2024 and a record low of 75.87600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clark County, IN - last updated from the United States Federal Reserve on March of 2026.