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,^{[upper-alpha 1]} respectively. As of the 2010 census, the MSA had a population of 60,888 (though a July 1, 2011 estimate placed the population at 61,476),^[1] making it the 4th smallest metropolitan area in the United States.

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. Hispanic or Latino of any race were 1.94% of the population.

The median income for a household in the MSA was $34,903, and the median income for a family was $42,402. Males had a median income of $35,249 versus $24,616 for females. The per capita income for the MSA was $18,146.

• Idaho census statistical areas
• Washington census statistical areas