Ransom Memorial Hospital was founded in the spring of 1931, after money was donated by a married couple and it was matched by the community. The two-story hospital was operated by eleven employees.[6] In 1954, money was raised and a new wing was added on the southeast side, it opened in 1956.[6] In 1968, a third floor was added to the southeast wing.[6] In 1974, a west wing was built.[6] In 1990, the southern part of the original building and first addition wing were demolished.[6] And construction began on a new hospital building, in December 1991 it opened.[6] In 1992, what was left of the original building was demolished.[6]
On May 1, 2019, Ransom Memorial Health was rebranded to AdventHealth Ottawa, after AdventHealth signed a lease with Franklin County to operate the hospital.[7][8]
On June 14, 2025, AdventHealth Ottawa expanded its partnership with NorthStar Anesthesia to help it reopen its obstetrics program.[9][10]
