Crescent Bar is a resort area and census-designated place (CDP) in Grant County, Washington, United States. As of the 2020 census, it had a population of 325. The CDP is on the western edge of the county, on the east side of the Columbia River. A portion of the community occupies an island (Crescent Bar) in the river. The community is 2 miles (3 km) south of Washington State Route 28 at Trinidad. SR 28 leads east 7 miles (11 km) to Quincy and northwest 24 miles (39 km) to Wenatchee.