Marcus Hook is a borough in Delaware County, Pennsylvania, United States. The population was 2,397 at the 2010 census. The current mayor is Gene Taylor. The borough calls itself "The Cornerstone of Pennsylvania". The 2005 film One Last Thing... was set and partially filmed in Marcus Hook.
The earliest inhabitants of Marcus Hook were the Lenape Indians and their indigenous ancestors, whose succeeding cultures had occupied this area for thousands of years.
The Lenape had a major settlement in Marcus Hook; New Sweden colonists established a trading post here in the 1640s. The village was called Chammassungh, or "Finland" by the Swedes. It was located on the west side of the Delaware River, between Marcus Hook Creek and Naamans Creek.