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is a city in Grant County, Indiana, United States. The population was 30,830 at the 2006 census. The city is the county seat of Grant County. It is named for Francis Marion, a Brigadier General from South Carolina in the American Revolutionary War.
The city is the home of Indiana Wesleyan University, the largest evangelical Christian university in the Midwest and largest private university in Indiana. Since 2003, former Olympic skater (and IWU alum), Wayne Seybold, has been Marion's mayor. Marion is also noted for being the birthplace of legendary actor James Dean and famed cartoonist Jim Davis, though both were raised in nearby Fairmount, Indiana. It was also the site of actress Julia Roberts and singer Lyle Lovett's wedding in 1993.
According to the United States Census Bureau, the city has a total area of 13.3 square miles (34.6 km²), of which, 13.3 square miles (34.4 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.30%) is water.