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Middletown is a census-designated place (CDP) in Bethlehem Township, Northampton County, Pennsylvania. Middletown is part of the Lehigh Valley, which has a population of 861,899 and is the 68th most populated metropolitan area in the U.S. as of the 2020 census. The population of Middletown was 7,441 at the 2010 census. [edit] Research Tips
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