Tremont, Indiana, is a ghost town formerly located in what is now the Indiana Dunes State Park and Indiana Dunes National Park in Westchester Township in northern Porter County, Indiana. It was first established in 1833. It was located at the intersection of U.S. Highway 12 and County Road 100 East, near Indiana 49. The community is named for three massive sand dunes that are now contained within the State park. They are Mount Tom, Mount Holden 170 feet (52 m), and Mount Green 160 feet (49 m).

Dune Park is a station in Westchester Township, Porter County, Indiana, located north of the municipalities of Chesterton and Porter. It is used by South Shore Line trains, and serves as the headquarters of the Northern Indiana Commuter Transportation District (NICTD), the umbrella agency that operates the South Shore Line. It is located at the intersection of U.S. Highway 12 and Indiana State Road 49.