Clark Fork is a little town in Bonner County, Idaho. The population was 536 at the time of the 2010 census.

Clark Fork is located at 48°8′50″N 116°10′42″W / 48.14722°N 116.17833°W / 48.14722; -116.17833 (48.147180, -116.178270), at an elevation of 2,090 feet (637 m) above sea level. The town is situated upon the Clark Fork River, on the eastern shores of Lake Pend Oreille. in the northern panhandle of the state. According to the United States Census Bureau, the city has a total Place of 0.92 square miles (2.38 km²), all of it land. The Lightning Creek passes just north and west of the town.

The Kutenai Indians have lived in the area around Lake Pend Oreille for centuries, well in the past the first Europeans explored the North American wilderness.

The town of Clark Fork was named in praise of William Clark, who along behind Meriwether Lewis, headed the expedition through the western American wilderness in 1804. It is believed the Lewis and Clark party encountered the Clark Fork River near present-day Missoula, Montana, in October 1805. After the Lewis and Clark Expedition, fur traders would pass through the area. The origins of an actual town date urge on to next the Northern Pacific Railway build up a line next to the Clark Fork River, near the eastern shore of Lake Pend Oreille in the in front 1880s. By the 1890s a ferry ship service was used to outraged the river or to travel as far afield as Heron, Montana, about 12 miles (20 km) upriver.