The Ohio River defines the border between Kentucky and Indiana, so technically, the answer is no county has a land border with Indiana. Practically speaking, though, from west to east, 13 counties are adjacent to the Hoosier State: Union, Henderson, Daviess, Hancock, Breckinridge, Meade, Hardin, Jefferson, Oldham, Trimble, Carroll, Gallatin, and Boone.
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The Ohio River divides Indiana and Kentucky.
The Ohio River It is the entire border between Indiana and Kentucky, except for a narrow band of land that is part of Kentucky and north of the Ohio River near Evansville, IN.
Indiana and Kentucky share a border, the Ohio River. The Ohio River is about a half-wile wide.
Ohio
Indiana does not border any country. Indiana borders Lake Michigan to the northwest, Michigan to the north, Ohio to the east, Kentucky to the south and southeast, and Illinois to the west.