Exeter is a borough in the Greater Pittston area of Luzerne County, Pennsylvania, about 10 miles (16 km) west of Scranton. The borough is in the middle of a fertile agricultural area, and some lumber and coal-mining had been carried out early on. In 1900, the population consisted of 1,948 persons; in 1910, 3,537 persons; and in 1940, 5,802 persons. The population was 5,955 at the 2000 census.
Exeter is located at 41°19′32″N 75°49′10″W / 41.32556°N 75.81944°W / 41.32556; -75.81944 (41.325530, -75.819353).
According to the United States Census Bureau, the borough has a total area of 5.0 square miles (12.8 km²), of which, 4.7 square miles (12.1 km²) of it is land and 0.3 square miles (0.8 km²) of it (6.25%) is water. It lies on the west side of the Susquehanna River and has two distinct islands: Wintermoot and Scovell. It also has a number of smaller islands.