Milton District High School
Milton District High School( MDHS) is a public secondary school located in Milton, Ontario, Canada.
MDHS, which is commonly referred to as M.D. by locals, is part of the Halton District School Board, and educates approximately 1050 students.
The school opened in 1960, before which time secondary school students in town had attended the Milton High School on Martin Street.
When the new high school opened, grade 10 to 12 students were transferred there, and Martin Street School became a high school, serving students in grade 9 only.
MDHS remained the only secondary school in Milton until E.C. Drury High School opened in 1980, followed by Bishop P. F. Reding Catholic Secondary School in 1986.
Glengarry District High School
Glengarry District High School is an English public high school located in Alexandria, Ontario.
Mackenzie High School (Michigan)
Mackenzie High School was a public high school in Detroit, Michigan.
South Greene High School
South Greene High School( SGHS) is a high school located south of Greeneville, Tennessee in the South Greene community.
Established in 1965, it is part of the Greene County School System.
South Greene High School's athletic teams are known as the Rebels.
West High School (Phoenix, Arizona)
West High School was a high school that formed part of the Phoenix Union High School District in Phoenix, Arizona.
Wheeling High School
Wheeling High School, or WHS, is a public four- year high school located in Wheeling, Illinois, a northwest suburb of Chicago, Illinois, in the United States.
It is part of Township High School District 214, which also includes Buffalo Grove High School, Elk Grove High School, John Hersey High School, Prospect High School, and Rolling Meadows High School.
The school serves the communities of Wheeling, Prospect Heights, Arlington Heights, and Buffalo Grove and Mount Prospect.
" U.S. News& World Report" ranked WHS as the 6th high school in District 214, the 90th high school in Illinois, and as the 2,448th high school in the United States in 2019.
Georgetown District High School
Georgetown District High School or better known as GDHS is a high school located in Georgetown, Ontario, Canada.
The school is under the jurisdiction of the Halton District School Board.
As of the 2019-20 school year, approximately 1,500 students were enrolled at Georgetown District High School.
Ottawa High School and Junior High School
The Ottawa High School and Junior High School, located at 526 and 506 S. Main St. respectively, are the historic former high school and junior high school in Ottawa, Kansas.
The high school was built in 1917, while the junior high school was built from 1927 to 1928; an enclosed hallway connecting the two buildings was built with the junior high school.
The high school was the first school in Ottawa to be built solely as a high school and the eighth school built in Ottawa.
George P. Washburn& Son designed the high school in the Collegiate Gothic style.
When the junior high school was constructed ten years later, the firm, by then known as Washburn& Stookey, designed the building in the same style as the high school.
In 1966, a new high school was built for the upper three classes of students; the freshman class moved to the building in 1976, and the old high school and junior high school became a middle school.
The two buildings were connected by a multi-purpose room in the same year.
The middle school later vacated the building.
The school was added to the National Register of Historic Places on October 6, 2000.
Canyon High School (Ogden, Utah)
Canyon High School was a high school in Ogden, Utah.
Calloway County High School
Calloway County
High School is a public high school located in Murray, Kentucky.
The school was formed from the consolidation of six high schools from across the county: Hazel High School, Lynn Grove High School, Kirksey High School, Almo High School, New Concord High School, and Faxon High School.

Question: Which high school was opened first, South Greene High School or Milton District High School?
Answer: Milton District High School