New Castle, city, seat (1821) of Henry county, eastern Indiana, U.S. It lies along the Blue River, 50 miles (80 km) east of Indianapolis. It was founded in 1820 and named by Ezekiel Leavell for his hometown in Kentucky, and it was incorporated in 1839. In 1900 a decade of expansion began when automobile and piano manufacturing, as well as other industries, were started there. During this same period, the large-scale commercial growing of roses was developed. New Castle’s diversified manufactures now include automobile parts and steel products. The city is the site of the Indiana Basketball Hall of Fame and a branch of Indiana University East. Summit Lake State Park is 10 miles (16 km) northeast of the city. A nearby farm, now a state memorial, was the birthplace (1867) of aviation pioneer Wilbur Wright. Pop. (2000) 17,780; (2010) 18,114.