Throop ( /truːp/) is a borough in Lackawanna County, Pennsylvania, adjoining Scranton. Formerly, coal mining and silk manufacturing provided employment for the people of Throop, who numbered 2,204 in 1900 and 5,133 in 1910. In 1940, 7,382 people lived in Throop, Pennsylvania. The population was 4,010 at the 2000 census.
Throop is located at 41°26′44″N 75°36′52″W / 41.44556°N 75.61444°W / 41.44556; -75.61444 (41.445536, -75.614494).
According to the United States Census Bureau, the borough has a total area of 5.0 square miles (13.1 km²), all of it land.