Alburtis is a borough in Lehigh County, Pennsylvania, United States. The borough's population was 2,596 as of the 2020 census. It is a suburb of Allentown, the third largest city in Pennsylvania. 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.