Lewistown (also Lewis Town or Lewiston) is a census-designated place in central Washington Township, Logan County, Ohio, United States. Until the 1829 Treaty of Lewistown, the community was the site of a Shawnee settlement. It said to have been named in honor of “Captain” John Lewis, a Shawnee leader. Nearby Indian Lake was once known as the Lewistown Reservoir, after this settlement. Although it is unincorporated, it has a post office, with the ZIP code of 43333. The population of the ZCTA for ZIP code 43333 was 693 at the 2000 census.
The area around Lewistown was populated by several Native American tribes resettled as a result of the Treaty of Fort Meigs. This treaty, signed on September 29, 1817 also provided for the University of Michigan, as well as other grants.
In the 1820s Lewistown was a village primarily inhabited by Seneca and Shawnee people. It was also the eastern point in a reservation for these groups that streched westward to the headwaters of Loramie Creek.