Odessa, DE has a population of 632 and is the 18,111th largest city in the United States. The population density is 1,243 per sq mi which is 238% higher than the Delaware average and 1272% higher than the national average. The median age in Odessa is 43 which is approximately 8% higher than the Delaware average of 40. In Odessa, 57% of the population over 15 years of age are married, 90% speak English and 4% speak Spanish. 56% of Odessa residents were born in Delaware, 35% were born out of state, 3% were born outside of the United States and 6% were foreign born.