The population of Emmaus was 11,313 at the 2000 census. In 2007 and 2009, Emmaus was listed as one of the top 100 "Best Places to Live" in the United States by Money magazine. Although Emmaus has been ranked as one of the "Best Places to Live", poverty and lack of education plague the apartment neighborhoods of South Emmaus.
According to the United States Census Bureau, the borough has a total area of 2.9 square miles (7.5 km²), all land, though parts of the Little Lehigh Creek, a tributary of the Lehigh River, flow just outside of the Emmaus border with Salisbury Township. Emmaus borders South Mountain, a large mountain range. The town's elevation is 436 feet above sea level.