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Winthrop is a city in Sibley County, Minnesota, United States. The population was 1,399 at the 2010 census. According to the United States Census Bureau, the city has a total area of 1.06 square miles (2.75 km²), all of it land.
The South Branch of the Rush River starts near Winthrop. Minnesota State Highways 15 and 19 are two of the main routes in the city. A post office called Winthrop has been in operation since 1882. Winthrop was incorporated as a city in 1910.
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