Marseilles is located in LaSalle County, Illinois. Marseilles is part of the Ottawa-Peru, Illinois Micropolitan Statistical Area. Marseilles is known for the Nabisco Building which was built in 1921 which at the time was the largest industrial building in the state outside of Chicago. The Nabisco company was a major employer in the area until the plant was closed in 2002.
Currently just over 5,000 people call Marseilles home.