Middletown is a city located in New Castle County Delaware. With a 2020 population of 23,984, it is the 4th largest city in Delaware (after Wilmington, Dover, and Newark) and the 1607th largest city in the United States . Middletown is currently growing at a rate of 2.31% annually and its population has increased by 27.09% since the most recent census, which recorded a population of 18,871 in 2010. Middletown reached it's highest population of 23,984 in 2021. Spanning over 12 miles, Middletown has a population density of 2,031 people per square mile.
The average household income in Middletown is $107,700 with a poverty rate of 6.26%. The median rental costs in recent years comes to $1,254 per month, and the median house value is $301,700. The median age in Middletown is 39.2 years, 37.1 years for males, and 42.2 years for females.