St. Marys, IA has a population of 210 and is the 24,231st largest city in the United States. The population density is 1,479 per sq mi which is 2607% higher than the Iowa average and 1533% higher than the national average. The median age in St. Marys is 59 which is approximately 54% higher than the Iowa average of 38. In St. Marys, 72% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 79% of St. Marys residents were born in Iowa, 21% were born out of state, 0% were born outside of the United States and 0% were foreign born.
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The population density in St. Marys is 2607% higher than Iowa.
The median age in St. Marys is 54% higher than Iowa.
In St. Marys 100.00% of the population is White.
In St. Marys 0.00% of the population is Black or African American.