Emmaus is a borough in Lehigh County, Pennsylvania, United States. As of the 2020 U.S. census, it had a population of 11,652. Emmaus is located in the Lehigh Valley, the third-largest metropolitan area in Pennsylvania and 68th-largest metropolitan area in the nation. In 2007 and again in 2009, Emmaus was listed as one of the top 100 "Best Places to Live" in the United States by Money magazine.