Middle River is a city in Marshall County, Minnesota, United States, along the Middle River, from which the city took its name. The population w…Middle River is a city in Marshall County, Minnesota, United States, along the Middle River, from which the city took its name. The population was 304 at the 2020 census. According to the United States Census Bureau, the city has a total area of 0.48 square miles, all land.
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