- Nicollet Island (/ˈnɪkəlɪt/ NIH-kə-lit) is an island in the Mississippi River just north of Saint Anthony Falls in central Minneapolis, Minnesota. According to the United States Census Bureau the island has a land area of 194,407 square metres (0.075 sq mi) and a 2000 census population of 144 persons. The island makes up a large part of the city-designated Nicollet Island/East Bank neighborhood. The island is named for cartographer Joseph Nicollet, who mapped the Upper Mississippi in the 1830s.