Middletown High School is located in Middletown, Maryland. First established in 1888, the school opened in its current building in April 1974.2016-2017 School Profile Enrollment - 1,126Demographics: American Indian/Alaskan Native: *, Asian: 2.8%, Black/African American: 1.4%, Hispanic/Latino: 4.6%, Hawaiian/Other Pacific Islander: *, White: 87.9%, 2+ Races: 3.0%