Dover, DE has a population of 37,351 and is the 1,113th largest city in the United States. The population density is 1,607 per sq mi which is 336% higher than the Delaware average and 1674% higher than the national average. The median age in Dover is 30 which is approximately 26% lower than the Delaware average of 40. In Dover, 40% of the population over 15 years of age are married, 89% speak English and 5% speak Spanish. 38% of Dover residents were born in Delaware, 53% were born out of state, 2% were born outside of the United States and 8% were foreign born.