Dauphin Island, AL has a population of 1,156 and is the 14,267th largest city in the United States. The population density is 185 per sq mi which is 101% higher than the Alabama average and 104% higher than the national average. The median age in Dauphin Island is 57 which is approximately 46% higher than the Alabama average of 39. In Dauphin Island, 69% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 48% of Dauphin Island residents were born in Alabama, 49% were born out of state, 0% were born outside of the United States and 3% were foreign born.