Whitemarsh Island, GA has a population of 6,922 and is the 5,220th largest city in the United States. The population density is 1,223 per sq mi which is 633% higher than the Georgia average and 1250% higher than the national average. The median age in Whitemarsh Island is 38 which is approximately 4% higher than the Georgia average of 36. In Whitemarsh Island, 58% of the population over 15 years of age are married, 90% speak English and 3% speak Spanish. 45% of Whitemarsh Island residents were born in Georgia, 47% were born out of state, 1% were born outside of the United States and 7% were foreign born.