Allentown is a city in eastern Pennsylvania, United States. The county seat of Lehigh County, it is the third-most populous city in Pennsylvania, w…Allentown is a city in eastern Pennsylvania, United States. The county seat of Lehigh County, it is the third-most populous city in Pennsylvania, with a population of 125,845 as of the 2020 census. It is also 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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