St. Louis is a city in Gratiot County in the U.S. state of Michigan. As of the 2010 census the population was 7,482. According to the United State…St. Louis is a city in Gratiot County in the U.S. state of Michigan. As of the 2010 census the population was 7,482. According to the United States Census Bureau, the city has a total area of 3.53 square miles, of which 3.34 square miles is land and 0.19 square miles is water.
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