Coplay is a borough in Lehigh County, Pennsylvania, United States. Coplay's population was 3,348 at the 2020 census. It is located six miles northwest of Allentown. The borough is part of the Lehigh Valley metropolitan area, 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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