In January 1890, Mrs. Elizabeth Harter, daughter of Cornelius Aultman, purchased 4.5 acres (1.8 ha) of land in the southwest end of Canton.

Three years later, another 117 beds were added by the opening of the Harter Annex.

The Main Building replaced the hospital's original structure and included 139 additional beds.

Currently, the hospital boasts 1032 beds and 530 active physicians in 43 specialties.

Aultman runs a Preferred Provider Organization, AultCare.