Ellwood City is a borough in Beaver and Lawrence counties in the U.S. state of Pennsylvania. Ellwood City is 30 miles northwest of Pittsburgh and some 8 miles south-southeast of New Castle. In the past, Ellwood City sustained many heavy industries such as steel-tube mills, steel-car works, building-stone and limestone quarries, foundries and machine shops, and coal-mining. The population was 7,921 at the 2010 census. Of the population, 7,289 lived in Lawrence County, while 632 lived in Beaver County.