St. Mary's, CO has a population of 329 and is the 21,978th largest city in the United States. The population density is 229 per sq mi which is 359% higher than the Colorado average and 152% higher than the national average. The median age in St. Mary's is 36 which is approximately 2% lower than the Colorado average of 36. In St. Mary's, 81% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 88% of St. Mary's residents were born in Colorado, 12% 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 359% higher than Colorado.
The median age in St. Mary's is 2% lower than Colorado.
In St. Mary's 100.00% of the population is White.
In St. Mary's 0.00% of the population is Black or African American.