Saint Marys, KS is a city located in Pottawatomie County, Kansas and has a land area of 65.42 square miles (169.44 km2). The water area for the city is 1.80 square miles or 4.66 km2. There is one unique zip code in Saint Marys, Kansas and it is 66536. The area code(s) for Saint Marys is 785.
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