Green Isle is a city in Sibley County, Minnesota, United States. The population was 522 at the 2020 census. The Minneapolis and St. Lou…Green Isle is a city in Sibley County, Minnesota, United States. The population was 522 at the 2020 census. The Minneapolis and St. Louis Railway originally built the railroad tracks between Norwood and Morton circa 1880. Green Isle was platted in 1881, incorporating these northeast/southwest-oriented tracks. The town was named after the previously existing township, its name alluding to Ireland, the Emerald Isle, as many of its earliest settlers were from Ireland.
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