Resident Population in Clark County, ID was 0.79400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Clark County, ID reached a record high of 1.02400 in January of 2000 and a record low of 0.70000 in January of 1972. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clark County, ID - last updated from the United States Federal Reserve on April of 2026.