World History Maps Interactive Historical Atlas of the Civil War, detail page for:

Ohio, State before Nov 6, 1860 - after Jun 25, 1865

William Dennison US Governor, before Nov 6, 1860 - Jan 13, 1862

US Dept. of The Ohio created Ohio Indiana and Illinois transferred from Dept. of the East., May 3, 1861
Area around Cincinnati transferred from US Dept. of the Cumberland to Dept. of the Ohio, Sep 19, 1861

David Tod US Governor, Jan 13, 1862 - Jan 11, 1864
US Mountain Dept. created parts of Ohio Michigan Kentucky and Tennessee transferred from Dept. of Ohio Western Virginia transferred from Dept. of Western Virginia Dept. of Western Virginia discontinued, Mar 11, 1862
US Dept. of the Ohio recreated Indiana Illinois Wisconsin eastern Kentucky western Ohio and western Michigan transferred from Dept. of the Mississippi eastern Ohio and eastern Michigan transferred from Dept. of the Potomac, Aug 19, 1862

Columbiana Belmont and Jefferson counties in Ohio transferred from US Dept. of the Ohio to Dept. of the Monongahela, Jun 9, 1863
US Dept. of West Virginia created western Virginia south of Ohio County and west of Hancock Maryland including adjacent counties of Ohio transferred from Middle Dept. to Dept. of West Virginia, Jun 24, 1863
Morganís Raid in Kentucky, Indiana, and Ohio, Jul 2, 1863 - Jul 26, 1863
Buffington Island, battle, Jul 19, 1863
Salineville, battle, Jul 26, 1863

John Brough US Governor, Jan 11, 1864 - after Jun 25, 1865
Columbiana Belmont and Jefferson counties in Ohio transferred from US Dept. of the Monongahela to Northern Dept., Jan 12, 1864
US Northern Dept. created Michigan Ohio Indiana and Illinois transferred from Dept. of the Ohio, Jan 12, 1864
Ohio election results: Lincoln 265674 56.4%, McClellan 205609 43.6%, Nov 8, 1864