School No. 3 once had its own school near Exeter Corner that was built in 1815 (Exact location unknown). Exeter High School was incorporated in March 1838 and did not have its own official building. Exeter High School became the third Free High School in Penobscot County and the eighth in the state of Maine. In 1855 School District No. 3 built a building that was used for both a high school and a public school.
This building is currently still standing and is used as a private residence.
