Summit Hill is a borough in Carbon County, Pennsylvania, United States. The population was 3,034 at the 2010 census. The hamlet has a storied history as the western terminus of the United States' second operational railway, the Mauch Chunk & Summit Hill Railway, and some of the earliest coal mines developed in North America, where the Lehigh Coal Mining Company began mining in 1792, establishing the town as little more than a mining camp with stables and paddocks.
Anthracite coal was discovered on the ridgeline of Sharpe Mountain (now known as Pisgah Mountain) in 1791 by a hunter, and news of the find led to the founding of the Lehigh Coal Mining Company in 1792 which began exploring the area in earnest and buying up promising land. Coal was found in 1794 by Phillip Ginter along the northeast-to-southwest-running ridgeline of Pisgah Mountain lying several hundred feet below the ridge on the north slope in an area that became the boroughs of Summit Hill and Lansford.
The Summit Hill High School was added to the National Register of Historic Places in 2001.
Summit Hill is located in western Carbon County at 40°49′39″N 75°51′57″W (40.827420, -75.865892). The main development of the borough is on the crest of Pisgah Mountain, but the borough limits extend north to the ridgecrest of Nesquehoning Mountain, south to the far side of Mauch Chunk Ridge, and east to cover most of Mauch Chunk Lake. Also on the northern border is the borough of Lansford, while Tamaqua in Schuylkill County is on the western border.
According to the United States Census Bureau, Summit Hill borough has a total area of 9.1 square miles (23.6 km2), of which 8.7 square miles (22.5 km2) is land and 0.42 square miles (1.1 km2), or 4.54%, is water. Summit Hill is located 6 miles (10 km) southwest of Jim Thorpe and 1 mile south of Lansford.