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Commanded by Brigadier General Jacob D. Cox
The District had been part of the Mountain Department until June 26, 1862, when it was absorbed into Major General John Pope’s Army of Virginia. Cox’s four brigades continued to operate independently in West Virginia.
| 1st Brigade | Colonel Eliakim Scammon | |
| 12th Ohio Infantry Regiment | Colonel Carr B. White | |
| 23rd Ohio Infantry Regiment | Lt. Colonel Rutherford B. Hayes | |
| 30th Ohio Infantry Regiment | Colonel Hugh Ewing | |
| 1st Ohio Independent Battery | ||
| 2nd Brigade | Colonel August Moor | |
| 28th Ohio Infantry Regiment | Lt. Colonel Godfried Becker | |
| 34th Ohio Infantry Regiment | Colonel John T. Toland | |
| 37th Ohio Infantry Regiment | Colonel Edward Siber | |
| Simmond’s Kentucky Battery | ||
| 3rd Brigade | Colonel George Crook | |
| 11th Ohio Infantry Regiment | Colonel Augustus H. Coleman | |
| 36th Ohio Infantry Regiment | Lt. Colonel Melvin Clarke | |
| 44th Ohio Infantry Regiment | Colonel Samuel A. Gilbert | |
| 47th Ohio Infantry Regiment | Colonel Frederick A. Poschner (res. 7/17) Colonel Lyman S. Elliott |
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| 4th Brigade | Colonel Joseph A.J. Lightburn | |
| 4th West Virginia Infantry Regiment | Colonel Joseph A.J. Lightburn | |
| 9th West Virginia Infantry Regiment | Colonel Leonard Skinner | |
| 1st West Virginia Cavalry (det) | ||
| Schambeck’s Illinois Cavalry Co. | ||
| Unattached | ||
| 2nd West Virginia Cavalry Regiment | Colonel William M. Bolles (res. 6/25) | |
| 3rd Independent Ohio Cavalry Co. | ||