Goodyears Bar, known as Slaughter's Bar before 1851, is a census-designated place (CDP) in Sierra County, California, United States. As of the 2020 census, Goodyears Bar had a population of 69. Goodyears Bar is located along the North Yuba River and California State Route 49 3.25 miles (5.23 km) west-southwest of Downieville. Goodyears Bar has a post office with ZIP code 95944. The post office opened in 1851.