St. George Island, MD has a population of 229 and is the 23,850th largest city in the United States. The population density is 291 per sq mi which is 39% lower than the Maryland average and 221% higher than the national average. The median age in St. George Island is 52 which is approximately 37% higher than the Maryland average of 38. In St. George Island, 54% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 66% of St. George Island residents were born in Maryland, 34% were born out of state, 0% were born outside of the United States and 0% were foreign born.