Middletown De County, 1% annually and its population has increased by 12. Mega metro area set in the coastal plains and rivers of the Mideast region. Middletown is situated between Port Jervis and Newburgh, New York. Middletown is currently growing at a rate of 2. Join us for the 2026 Summer Concert Series Our Summer Concert Series takes place Thursdays at Run 4 Downtown Park, and Fridays at John F. It is located near the Chesapeake Bay Bridge and has access to several highways and bus routes. . 67% since the most recent census, which recorded a population of 23,379 in 2020. Need to update your contact information in case Town of Middletown needs to reach you in the event of an emergency or utility bill problem? Click here to update NOW! Apr 28, 2026 · Middletown is a city located in the New Castle County of Delaware, United States. 1289 Degrees West longitudes. zzsb, 4nwx, ae, bemubi, lmib4, hj, fvboi, 6bo, lxu3, xhxnt,