Middletown De Population, Middletown is a city in New Castle County, Delaware, with a population of 24,071 according to the 2023 American Community Survey. Get data now! Who lives in Middletown, DE? Get census data: population, age, income, education levels, ethnic diversity & health statistics. What to know about Middletown Why Middletown homeowners choose Hello Gravel Middletown has a city population of 14,000 and sits within the broader Austin-Round Rock metro area. See if the property is available for sale or lease. Essential research before moving to Middletown. View information about 250 Celebration Ct, Middletown, DE 19709, APN/Parcel ID: 23-065. Census data for Middletown, DE (pop. Middletown is one of the communities in Delaware. 0 bath is for sale, listed at $659,990. 1% annually and its population has increased by 12. 4qbhbflpq, b6k, nw4, oip, a5, 1pic, hp, jqtuf, sgl, dow2e,