Cobb Island, MD has a population of 836 and is the 16,298th largest city in the United States. The population density is 1,344 per sq mi which is 183% higher than the Maryland average and 1384% higher than the national average. The median age in Cobb Island is 40 which is approximately 5% higher than the Maryland average of 38. In Cobb Island, 65% of the population over 15 years of age are married, 94% speak English and 0% speak Spanish. 65% of Cobb Island residents were born in Maryland, 29% were born out of state, 0% were born outside of the United States and 6% were foreign born.