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is a town in Westchester Township, Porter County, Indiana, United States. The population was 4,972 at the 2000 census.
Porter is noted for its proximity to the Indiana Dunes State Park and for its railroad heritage. Porter was the southern terminus for the Chicago and West Michigan Railway.
According to the United States Census Bureau, the town has a total area of 6.6 square miles (17.1 km²), of which, 6.3 square miles (16.3 km²) of it is land and 0.3 square miles (0.8 km²) of it (4.54%) is water.