On October 31st of that year, the structure was dedicated to hard working, intelligent, young men and women of Guam's Education Department and in honor of the first President of the United States and its Territories, George Washington High School was established by then Governor Benjamin McCandlish.

When the institution opened its doors, Mrs. Agueda Iglesias Johnston, a prominent Chamorro woman educator was the first presiding principal. In July of 1936, the first school year rang in and Mrs. Johnston, the school's faculty, staff, and students began what Guam would hold as an educational milestone.

For the first school year, enrollment tolled at a high number of five-hundred (500) students; this enrollment included junior and senior high school students. Two sessions were implented in order to accomodate both divisions; this left the junior high students to attend a morning session and the senior high students the afternoon.

On March 31st of 1937, sixty-four (64) young men and women proudly graduated from the ninth (9th) grade. In June of 1940, the first Senior class of the institution graduated.

The school was re-established in the same area on November 10th of 1944, four months after Guam's reoccupation. Only posts of concrete that were ruined stood on the grounds of the former school because of the U.S. Forces wartime bombardment of the island.

In 1945, the Naval Government transferred the institution to its new home in Sinajaņa. Classroom space was still limited as enrollment increased. By then, approximately one-thousand (1000) students were to be accomodated underneath a number of quonset huts. By the summer of 1950, once more, the school was then transferred to the former Fifth Marine Depot in Mongmong.

The summary enrollment of the 1953 - 1954 school year, escallated to a high number of 1,937 students. The enrollment included a number two-hundred fifteen (215) stateside students and about one-hundred (100) from other surrounding islands and territories.

In the years of 1954 - 1959, the student population once more was increasing; this left the faculty and staff and let alone, the Government to cope with housing and accomodating each student. Continuously, quonset huts were transformed into classrooms to accomodate 2,200 students. In the reign of these three years, accreditation plans began.

The North Central Association of Colleges and Secondary Schools established GWHS as a member in 1957. The desire continued for the Department of Education to maintain George Washington High School at standards by the NCA to surely attain its accreditation.

At the old Mongmong Elementary School, grades seven (7) to nine (9) were housed in 1962 - 1963. Although, Typhoon Karen stormed in on November 11th of 1962 and destroyed the school. The Education department resolved the accomodation of 1,500 high school students by implementing a double session at Guam's Tumon High School, now known as John F. Kennedy High School.

Typhoon Karen's devistating impact left a hectic four (4) years for the institution, commencing in 1962 and roughly concluding in 1965. The impact resulted in a predicament of the housing of students and in a change of school administrative officials.

It was then that plans arose and were completed in 1966 for GWHS in its present location in the village of Mangilao. The first class to graduate from the new facility was the Senior class of 1967.