Clark County is the name of twelve counties in the United States. Most, though not all, are named after two brothers: military hero George Rogers Clark in the Midwest, and explorer William Clark in the West.

• Clark County, Arkansas
• Clark County, Idaho
• Clark County, Illinois
• Clark County, Indiana
• Clark County, Kansas
• Clark County, Kentucky
• Clark County, Missouri
• Clark County, Nevada, the most populous county bearing the name Clark, containing Las Vegas
• Clark County, Ohio
• Clark County, South Dakota
• Clark County, Washington
• Clark County, Wisconsin

• Clarke County (disambiguation)
• Lewis and Clark County, Montana

This disambiguation page lists articles about distinct geographical locations with the same name.
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