According to census records and death records he was born in Md. and died in Harrison Co. Oh.. Thomas served in War of 1812 in Maryland Militia, served under Capt. Thomas Blair.  Company primarily from Cumberland Md..  Made a land patent in Harrison Co. Ohio on 5/25/1825 (S.E. 28.17.7)
He is buried at Mayes Cemetery, Harrison Co. Oh, along with wife Barbary (according to stone).  A  son Thomas H Irons in biographical sketch found in
Biographical Record of Harrison and Carrol Counties Ohio (Pages 580-581), states: "He was the son of Thomas and Mary (Davidson) Irons who married              in 1825.  Thomas (Sr) (which is really my Jr) died 12/30/1870 in Harrison Co."  Death record in Harrison Co. Oh. states: died January 5, 1871, age 71 yrs.   
2mo., 23 days. Died Washington Twp. , born Maryland. Cause of death unknown.   Barbara A Irons death record Harrison Co. Oh. states: died 11.11.1876 ,
age 73 yrs.,  born Harrison Co. Oh...  A land transaction on 12/7/1860 lists Thomas Irons and wife Mary.  A will for Thomas Irons (Sr)(my Jr.) was probated on 1/16/1871: names wife Barbary A., daughter Elizabeth Hines(and children) and son Thomas H Irons Jr.  1850 Harrison Co. Census would list children, but have not looked up.  1830 Harrsion lists one daughter age 0-5.

Thomas H. Irons Jr. just mentioned: Will probated 10/30/1876: mentions wife Permelia (Mitchell), but no named children (Biographical sketch above lists 3 of              six living: Mary A Morris, Agnes G. Stewart and Ella Latto).  Thomas H Irons death record in Harrison Co.  Oh. states: died 10/21/1876, age 44 yrs., 3 months, 16 days.  Born Harrison Co. Ohio. Cause of death typhoid fever.