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Warren continued to grow in the twentieth century. During the late nineteenth and early twentieth centuries, steel production was a major industry in the county because of large deposits of coal and iron ore in surrounding counties. In recent years, many Warren residents have worked in local service and retail sales businesses. In 2000, Warren was Trumbull County's most populated community, with 46,832 residents. Many examples of late 19th and early 20th century architectural styles still stand in downtown Warren, including the Trumbull County Courthouse, which contains one of the largest courtrooms in the state of Ohio, and the Trumbull County Carnegie Law Library; in addition to office buildings, banks, stores, and homes surrounding the Courthouse Square area.