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Sigmund is an unincorporated community in Upper Milford Township in Lehigh County, Pennsylvania. Sigmund is located near Perkiomen Creek, a tributary of the Schuylkill River. It is a suburb of Allentown in the Lehigh Valley, which has a population of 861,899 and is the 68th most populous metropolitan area in the U.S. as of the 2020 census.