Middletown is a census-designated place (CDP) in Bethlehem Township in Northampton County, Pennsylvania, United States. The population of Middletown was 7,441 at the 2010 census. Middletown is part of the Lehigh Valley, which had a population of 861,899 and was the 68th-most populous metropolitan area in the U.S. as of the 2020 census.

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Overview

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