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is a town in St. John Township, Lake County, Indiana, United States. St. John was founded in 1837. The population was 8,382 at the 2000 census.
St. John is located at .
According to the United States Census Bureau, the town has a total area of 6.8 square miles (17.5 km²), of which, 6.7 square miles (17.4 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.74%) is water.