Dorneyville is a census-designated place in Lehigh County, Pennsylvania. As of the 2020 census the population was 4,850. Dorneyville is located just west of Allentown in South Whitehall Township and Salisbury Township. It is located off Interstate 78 and is home to the northern terminus of U.S. Route 222. It is split between the Allentown ZIP codes of 18103 and 18104. 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.