Delaware City, DE has a population of 1,872 and is the 11,417th largest city in the United States. The population density is 992 per sq mi which is 169% higher than the Delaware average and 995% higher than the national average. The median age in Delaware City is 36 which is approximately 10% lower than the Delaware average of 40. In Delaware City, 46% of the population over 15 years of age are married, 92% speak English and 3% speak Spanish. 64% of Delaware City residents were born in Delaware, 29% were born out of state, 1% were born outside of the United States and 7% were foreign born.