https://archive.org/details/ohiowarroster05howerich/page/446/mode/2up?q=Trump
According to this record: John Trump was 22 when he enlisted in Company C, 64th OVI on 22 Oct 1861. He was killed in the Battle of Rocky Face Ridge, GA, on 9 May 1864. Flipping to the Roll of Honor (cited above comment pg. 776) he was interred in Chattanooga, TN.
If this is your ancestor, it should answer your question.
Following up on this question, I looked in the "Final Disposition, Vol 1, From Places in Tennessee, Alabama, Georgia & Virginia to Cemeteries in Tennessee, pg. 22. I found it on Ancestry. It tells us that between June and July, 1866, Union Soldiers were disinterred from Resaca (1,036) and Dalton (328) and reinterred in Chattanooga National Cemetery, Hamilton Co. TN.
The Battle of Rocky Face Ridge took place near Dalton and Resaca, GA. On May 9, 1864, Maj. Gen. McPherson passed through Snake Creek Gap to the outskirts of Resaca where he had to back up to Snake Creek Gap because Confederates were entrenched at Resaca.
Taking a logical guess, I'd say your ancestor was most likely killed in that area, maybe just outside of Resaca, and was likely buried with the other Union soldiers in Resaca before being reinterred after the war in Chattanooga.
https://www.ancestry.com/imageviewer/collections/48559/images/FinalDispositionI-007319-23?ssrc=&backlabel=Return&pId=400004
Hope this helps.