Pennsylvania, United States·1K residents
Belfast is a census-designated place (CDP) in Plainfield Township in Northampton County, Pennsylvania, United States. It 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. As of the 2020 census, Belfast had a population of 1,279.
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