Hannibal, MO

ZIP code 63401 is located in Hannibal, Missouri. This historic town is known for being the hometown of Mark Twain and boasts landmarks such as the Mark Twain Boyhood Home and Museum, the Mark Twain Cave, and the Hannibal History Museum. The zipcode also includes popular attractions like the Hannibal Regional Airport and the Riverview Park with its stunning views of the Mississippi River.