St. Marys or Saint Marys is a city in Pottawatomie and Wabaunsee counties in Kansas of the United States. As of the 2020 census, the p…St. Marys or Saint Marys is a city in Pottawatomie and Wabaunsee counties in Kansas of the United States. As of the 2020 census, the population of the city was 2,759. It is a population center of Traditionalist Catholicism and the home of Saint Mary's Academy and College.
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