Friendly High School is a public high school in Friendly census-designated place in unincorporated Prince George's County, a county in the state of Maryland in the United States; it has a Fort Washington postal address. The school's first classes began in 1970 with 9th, 10th and 11th grades. Friendly graduated its first seniors in 1972, while housing students in grades 10-12. In 1981 a 9th grade class was added at that point the high school had 9th, 10th, 11th and 12th grades and Jr. high schools were then renamed Middle Schools and consisted of 7th and 8th grades.