Resident Population in Clark County, AR was 20.92000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Clark County, AR reached a record high of 23.92200 in January of 2008 and a record low of 20.91800 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clark County, AR - last updated from the United States Federal Reserve on April of 2026.