St. Marks, FL has a population of 237 and is the 23,678th largest city in the United States. The population density is 122 per sq mi which is 58% lower than the Florida average and 35% higher than the national average. The median age in St. Marks is 52 which is approximately 24% higher than the Florida average of 42. In St. Marks, 68% of the population over 15 years of age are married, 92% speak English and 6% speak Spanish. 48% of St. Marks residents were born in Florida, 49% were born out of state, 0% were born outside of the United States and 3% were foreign born.
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The population density in St. Marks is 58% lower than Florida.
The median age in St. Marks is 24% higher than Florida.
In St. Marks 98.73% of the population is White.
In St. Marks 0.00% of the population is Black or African American.