![]() ![]() Beginning in the early 1980s, however, the region's heavy manufacturing sector experienced a rapid downfall, highlighted by the downsizing and ultimate closure of Bethlehem Steel, once the world's second-largest steel manufacturer, and other Valley-based manufacturing companies. The Lehigh Valley has historically been a global leader in steel and other heavy manufacturing industries, which represented a considerable portion of its employment and economic production for most of the 20th century. ![]() ![]() The region's core population centers are located in southern and central Lehigh and Northampton counties along Interstate 78, Interstate 476, Pennsylvania Route 309, and U.S. Lehigh County is among Pennsylvania's fastest-growing counties, and the Lehigh Valley leads Pennsylvania in terms of population growth in the 18- to 34-year old demographic, which constitutes a significant portion of the labor workforce. The Allentown– Bethlehem– Easton metropolitan area, which includes the Lehigh Valley, is currently Pennsylvania's third-most populous metropolitan area after those of Philadelphia and Pittsburgh, and the nation's 68th-largest metropolitan area with a population of 861,889 residents as of 2020. The Lehigh Valley's largest city is Allentown, the third-largest city in Pennsylvania and the county seat of Lehigh County, with a population of 125,845 residents as of the 2020 census. The Valley is about 40 miles (64 km) long and 20 miles (32 km) wide. It is a component valley of the Great Appalachian Valley bounded to its north by Blue Mountain, to its south by South Mountain, to its west by Lebanon Valley, and to its east by the Delaware River and Warren County, New Jersey. The Lehigh Valley ( / ˈ l iː h aɪ/), known colloquially as The Valley, is a geographic and metropolitan region formed by the Lehigh River in Lehigh and Northampton Counties in the eastern part of the U.S. Ridge-and-Valley Appalachians Blue Mountain (north) Location of the Lehigh Valley in Pennsylvania ![]()
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