Selbyville, DE has a population of 2,268 and is the 10,344th largest city in the United States. The population density is 629 per sq mi which is 71% higher than the Delaware average and 595% higher than the national average. The median age in Selbyville is 38 which is approximately 4% lower than the Delaware average of 40. In Selbyville, 58% of the population over 15 years of age are married, 72% speak English and 27% speak Spanish. 28% of Selbyville residents were born in Delaware, 52% were born out of state, 1% were born outside of the United States and 19% were foreign born.