Eastlawn Gardens is a census-designated place in Upper Nazareth Township in Northampton County, Pennsylvania, United States. The population of Eastlawn Gardens was 3,307 at the 2010 census. Eastlawn Gardens 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.