Harrison School began as Harsh School about 1850 and was a log building. The District included a dozen farmhouses. In 1870, the log building burned and a brick building was erected. It was an ungraded one-room school which older boys attended only from November through March so they could help on the farms.

The Harsh name was dropped in the late 1870's and the school was named Harrison, the name of the largest family attending. In 1916, the brick building was torn down, and a small frame building was built. With the development of Wonder Lake in 1929-30, the population gradually grew. In 1941-42 the frame building was replaced with a larger building and indoor water and plumbing. A west wing was added in 1946. The School Board changed from a 3-person to a 7-person Board in 1948-49. The same year the east wing was added, and the school land was purchased. In 1955 eight modern classrooms were added with administrative offices, gymnasium, lunchroom and library. A further addition of four rooms was added to the building in 1959.

A major project was initiated during 1969 and 1970 to add a number of classrooms. Remodeling of the existing building was undertaken to make it better fit the instructional program. The Merl Thomas Learning Resource Center was dedicated in January, 1971.

During the summer and fall of 1971, the field behind the school was leveled, seeded, and athletic equipment purchased. On July 4, 1972, a dedication ceremony was held naming the newly renovated field - Cristy Field. This was done in recognition of the Kenneth and Jay Cristy, Sr., families who had done so much to improve the outdoor facilities of the school.

The older portion of the building that was constructed in 1941-42 was torn down during the summer of 1984 due to its poor physical condition.

Harrison School has grown from a one-room school in 1942 to a 30+ classroom school. Since 1994, we have modified classrooms; purchased new furniture and equipment; created a new Kindergarten and Art Room from existing space; modified the LRC to three classrooms; renovated the old gym to a modern Technology and Learning Center and erected a new gym and linking corridor to the main building. A low-interest, state granted Technology Loan in 2000 made possible the wiring of the entire school for enhanced internal and external communications.