The Lehigh Valley (/ˈliːhaɪ/), known officially by the United States Census Bureau and the United States Office of Management and Budget as the Allentown–Bethlehem–Easton, PA–NJ Metropolitan Statistical Area and referred to colloquially as The Valley, is a metropolitan region officially consisting of Carbon, Lehigh and Northampton counties in eastern Pennsylvania and Warren county on the western edge of New Jersey, in the Eastern United States. The Lehigh Valley's largest city, with a population of 120,443, is Allentown.
The region is a part of the larger New York City metropolitan area, but borders the Philadelphia metropolitan area. All of the region, except Warren County, New Jersey, is part of Philadelphia's designated media market.
The Lehigh Valley is the third most populous Metropolitan Statistical Area in the state of Pennsylvania with a population of 821,173 residents as of the 2010 U.S. Census. The region is eclipsed in total population in Pennsylvania only by the metropolitan areas of Philadelphia and Pittsburgh metropolitan areas. It is the 64th most populated metropolitan area in the United States. Lehigh County, the Valley's largest county in terms of overall population, is among the fastest growing in the state and, as of 2010–2012, ranks in the 79th percentile for population growth nationally. The core population centers are located in southern and central Lehigh and Northampton counties along U.S. Route 22 and Interstate 78. The Lehigh Valley is proximate to two of the nation's largest cities: New York City, which is about 75 miles to its east, and Philadelphia, which is 50 miles to its southeast.
In March 2014, the Lehigh Valley was recognized by Site Selection Magazine as the second-best performing region of its size for economic development in the United States. It was also ranked by Fortune in May 2015 as being among the top 10 best places in the U.S. to locate corporate finance and information technology operations for companies, such as call centers and IT support. Allentown, the region's largest city, was cited as a "national success story" in April 2016 by the Urban Land Institute for its downtown redevelopment and transformation, one of only six communities nationwide to achieve this distinction.