Frankford, DE has a population of 840 and is the 16,268th largest city in the United States. The population density is 1,152 per sq mi which is 213% higher than the Delaware average and 1171% higher than the national average. The median age in Frankford is 36 which is approximately 9% lower than the Delaware average of 40. In Frankford, 57% of the population over 15 years of age are married, 80% speak English and 17% speak Spanish. 47% of Frankford residents were born in Delaware, 42% were born out of state, 0% were born outside of the United States and 10% were foreign born.