Marseilles is a city in LaSalle County, Illinois, United States. The population was 4,655 at the 2000 census. It is part of the Ottawa–Streator Micropolitan Statistical Area.
Lovell Kimball arrived at the area along the Illinois River known as the Grand Rapids in 1833 from Watertown, New York. Kimball, aware that the Illinois-Michigan Canal Bill had passed and the canal would eventually reach the rapids, hired a surveyor to lay out a town. Kimball called the town Marseilles, under the impression that Marseilles, France was an industrial center the likes of which he hoped to attain in Illinois. Marseilles was officially platted on June 3, 1835; the plat was revised twice for railroad and canal right-of-ways.
Marseilles is located at 41°19′40″N 88°42′4″W / 41.32778°N 88.70111°W / 41.32778; -88.70111 (41.327795, -88.701121). The city is at the head of rapids along the Illinois River historically known as "the Grand Rapids" or the "Rapids of Maninumba".