Clark Fork is a city in Bonner County, Idaho, United States. The population was 536 at the 2010 census. According to the United States Census Bureau, the city has a total area of 1.0 square mile (2.6 sq/km), all of it land. As of the census of 2000, there were 530 people, 238 households, and 138 families residing in the city. The population density was 538.8 people per square mile (208.8 sq/km). There were 286 housing units at an average density of 290.7 per square mile (112.7 sq/km). The racial makeup of the city was 93.96% White, 0.57% African American, 1.32% Native American, 0.19% Asian, 1.70% from other races, and 2.26% from two or more races. Hispanic or Latino of any race were 3.02% of the population.