From Service Record: He enlisted 14 Aug 1864 at West Liberty, Ohio County, (W) Va., and mustered in at Wheeling 25 Aug 1862. On detached service as clerk at Division Headquarters, Harper's Ferry, beginning December 2, 1863 per order of General Sullivan. On July 27/29, 1864, General Crook/Colonel Joseph Thoburn ordered Thomas J. Orr to serve at the Department/Division Headquarters. Mustered out 16 June 1865 at Richmond.

The soldier applied for a government pension in March 1891, and received Pension Certificate #707.251. Following his death, his widow also applied for and received a pension.

1880 Census, Ohio County, West Virginia
Thomas Orr, 40, Farmer, b WV, parents b WV
Sarah J., Wife, At home, b WV, parents b WV
Frank D., 12, Son, Works on Farm, b WV
Nettie R., 10, Dau, At home, b WV
Cordie [Cordelia] E., 9, Dau, b WV
Mary, 7 Dau, b WV
Thomas W., 1, Son, b WV

About 1901, they had a daughter Margaret "Maggie" who married George N. Richardson in June 1902.