Jessup is a borough in Lackawanna County, Pennsylvania, United States. The population was 4,676 at the 2010 census.
Jessup is located at 41°28′16″N 75°33′44″W (41.471131, -75.562171).
According to the United States Census Bureau, the borough has a total area of 6.75 square miles (17.5 km2), of which, 6.7 square miles (17 km2) of it is land and 0.05 square miles (0.13 km2) of it (0.74%) is water.
Settled in 1849, the town of Jessup was named after Judge William Jessup. It was presented to the Luzerne County Court for incorporation as the Borough of Winton in December 1876. Two years later, Lackawanna County was incorporated. The early 1890s were very significant for the little town, as numerous new mining operations were opened. Shortly after these were opened, immigrants from Europe were lured to the area by the work available in the booming anthracite coal fields.
At the 2010 census there were 4,676 people, 2,007 households, and 1,272 families residing in the borough. The population density was 697.9 people per square mile (269.5/km²).