Clarksburg, city (1990 pop. 18,059), seat of Harrison co., N central W.Va., at the confluence of Elk Creek and the West Fork of the Monongahela River; inc. 1795. It is an industrial and shipping center for an area of coal mines, oil and natural gas fields, and grazing lands. Glass and fabricated metal products, welding and transportation equipment, and machinery are manufactured. The city was an important Union supply base in the Civil War, and remains of Union earthworks are preserved in Lowndes Hill park. Clarksburg is the birthplace of Stonewall Jackson; a plaque designates the site. Salem International Univ. and the FBI fingerprint data center are outside the city.