Wampum is a borough in southern Lawrence County, Pennsylvania, United States. The population was 557 at the 2020 census. It is part of the Pittsburgh metropolitan area. Wampum is located at 40°53′19″N 80°20′23″W / 40.88861°N 80.33972°W. According to the U.S. Census Bureau, the borough has a total area of 1.0 square mile, of which 0.9 …Wampum is a borough in southern Lawrence County, Pennsylvania, United States. The population was 557 at the 2020 census. It is part of the Pittsburgh metropolitan area. Wampum is located at 40°53′19″N 80°20′23″W / 40.88861°N 80.33972°W. According to the U.S. Census Bureau, the borough has a total area of 1.0 square mile, of which 0.9 square miles is land and 0.04 square miles, or 4.17%, is water.