Cascade Locks is a city in Hood River County, Oregon, United States. The city got its name from a set of locks built to improve navigation past the Cascades Rapids of the Columbia River. The U.S. federal government approved the plan for the locks in 1875, construction began in 1878, and the locks were completed on November 5, 1896. The locks were subsequently submerged in 1938, replaced by Bonneville Lock and Dam, although the city did not lose land from the expansion of Lake Bonneville behind the dam some 4 miles (6 km) downstream of the city. The city population was 1,144 at the 2010 census.

Hood River County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 23,977. The county seat is Hood River. The county was established in 1908 and is named for the Hood River, a tributary of the Columbia River. Hood River County comprises the Hood River, OR Micropolitan Statistical Area. The Hood River Valley produces apples, pears, and cherries. Situated between Mount Hood and the Columbia River in the middle of the Columbia River Gorge, Hood River County is a popular destination for outdoor enthusiasts, such as windsurfers, mountain-bikers, skiers, hikers, kayakers, and many more.