St. Mary's, AK has a population of 521 and is the 19,282nd largest city in the United States. The population density is 12 per sq mi which is 962% higher than the Alaska average and 87% lower than the national average. The median age in St. Mary's is 29 which is approximately 14% lower than the Alaska average of 34. In St. Mary's, 46% of the population over 15 years of age are married, 65% speak English and 0% speak Spanish. 91% of St. Mary's residents were born in Alaska, 9% 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. Mary's is 962% higher than Alaska.
The median age in St. Mary's is 14% lower than Alaska.
In St. Mary's 3.45% of the population is White.
In St. Mary's 0.00% of the population is Black or African American.