Marcus Hook is a borough in Delaware County, Pennsylvania, United States. The population was 2,397 at the2010 census. The current mayor is Gene Taylor. The borough calls itself "The Cornerstone of Pennsylvania". According to the United States Census Bureau, Marcus Hook has a total area of 1.6 square miles (4.2 km2), of which 1.1 square miles (2.9 km2) is land and 0.50 square miles (1.3 km2), or 31.63%, is water.The lowest point in the state of Pennsylvania is located on the Delaware River in Marcus Hook, where it flows out of Pennsylvania and into Delaware.
In early times, Marcus Hook was a major Lenape settlement that became a New Sweden trading post in the 1640s. Called "Chammassungh" or "Finland", it was on the west side of the Delaware River, between Marcus Hook and the mouth of Naamans Creek. The settlement was renamed "Marrites Hoeck" after the Dutchconquered the area in 1655. Small ship construction and fishing were its early industries. Later, Marcus Hook became a resort and amusement center. The borough was officially incorporated on March 7, 1892. The convergence of rail, roads, a deepwater port, and the nation's growing thirst for petroleum gave rise to the refineries that became the borough's dominant industry.