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Pontoosuc is a village in Hancock County, Illinois, United States. The population was 146 at the 2010 census, down from 171 at the 2000 census.
Pontoosuc is located in northern Hancock County at 40°37′46″N 91°12′35″W (40.629520, -91.209603). It is bordered to the north by the Mississippi River, which forms the state border with Iowa, and to the east by Dallas City. Illinois Route 9 passes through the village, leading east into Dallas City and west 5 miles (8 km) to the Fort Madison Toll Bridge over the Mississippi. Illinois Route 96 passes through Pontoosuc concurrently with IL-9 but leads southwest 13 miles (21 km) to Nauvoo.
According to the 2010 census, Pontoosuc has a total area of 2.077 square miles (5.38 km2), of which 1.41 square miles (3.65 km2) (or 67.89%) is land and 0.667 square miles (1.73 km2) (or 32.11%) is water.
As of the census of 2000, there were 171 people, 74 households, and 50 families residing in the village. The population density was 121.3 people per square mile (46.8/km2). There were 122 housing units at an average density of 86.6 per square mile (33.4/km2). The racial makeup of the village was 98.83% White, and 1.17% from two or more races.