The crossword solution for the term 'Neighbor of Indiana' is Ohio, which is a four-letter word. Ohio is a state located in the Midwestern United States and is bordered by Indiana to the west, Pennsylvania to the east, West Virginia to the southeast, Kentucky to the south, and Michigan to the northwest. It is the 34th largest state in the United States and the 7th most populous. Ohio is known as the 'Buckeye State' and is home to many major cities such as Cleveland, Cincinnati, and Columbus.