Wilmington Island, GA has a population of 15,005 and is the 2,834th largest city in the United States. The population density is 1,822 per sq mi which is 991% higher than the Georgia average and 1911% higher than the national average. The median age in Wilmington Island is 44 which is approximately 22% higher than the Georgia average of 36. In Wilmington Island, 68% of the population over 15 years of age are married, 88% speak English and 6% speak Spanish. 45% of Wilmington Island residents were born in Georgia, 45% were born out of state, 2% were born outside of the United States and 8% were foreign born.