About the town » Hannibal, Monroe County, Ohio, United States

Hannibal is a census-designated place in eastern Ohio Township, Monroe County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 43931. As of the 2010 census, it had a population of 411. Hannibal lies along Ohio State Route 7. An Ohio River town, it lies below Powhatan Point and above Sardis.