Cementon is an unincorporated area and census-designated place in Lehigh County, Pennsylvania. The town is in Whitehall Township, 7 miles north of Allentown. As of the 2020 census, the population of Cementon was 1,657. Cementon is part of the Lehigh Valley metropolitan area, which had a population of 861,899 and was the 68th-most populous metrop…Cementon is an unincorporated area and census-designated place in Lehigh County, Pennsylvania. The town is in Whitehall Township, 7 miles north of Allentown. As of the 2020 census, the population of Cementon was 1,657. Cementon 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 2020. It uses the Whitehall Township ZIP Code of 18052.