The Lewiston–Clarkston metropolitan area—colloquially referred to as the Lewiston–Clarkston Valley or Lewis–Clark Valley (often abbreviated as LC Valley), and officially known as the Lewiston, ID–WA Metropolitan Statistical Area—is a metropolitan area comprising Nez Perce County, Idaho, and Asotin County, Washington.

The metro is anchored by the cities of Lewiston, Idaho, and Clarkston, Washington—named after Meriwether Lewis and William Clark,[A] respectively.

As of the census of 2000, there were 57,961 people, 23,650 households, and 15,803 families residing within the MSA.

The racial makeup of the MSA was 93.01% White, 0.25% African American, 3.88% Native American, 0.60% Asian, 0.06% Pacific Islander, 0.55% from other races, and 1.66% from two or more races.

Males had a median income of $35,249 versus $24,616 for females.