Allentown is the county seat of Lehigh County, Pennsylvania, United States. It is the third-most populous city in Pennsylvania with a popul…Allentown is the county seat of Lehigh County, Pennsylvania, United States. It is the third-most populous city in Pennsylvania with a population of 125,845 as of the 2020 census and the most populous city in the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metropolitan area in the nation as of 2020.
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