1840 William T Hartman lived in Jackson Twp, Clermont County, Ohio in a household with several persons, including three males age 20-30. 
1841 On 14 November, William T Hartman and Elizabeth Covalt were married in Brown County, Ohio. 
1850 William T Hartman (age 39) and Elizabeth Hartman (age 30) lived in Jackson Twp, Clermont County, Ohio with Francis M Hartman (age 21) and child William H Hartman (age 4). 
1877 Elizabeth Hartman, wife of W T Hartman, died 11 February 1877 at age 60y 16 d, and was buried at Hartman Cemetery, Clermont County, Ohio. 
1916 Son, William Henry Hartman died on 27 September 1916 at Jackson Twp, Clermont County, Ohio.William Hartman was a widowed lawyer. He was born 11 August 1845 in Ohio with parents William T. Hartman and Betsy Cavolt. Stella White was the informant. 
 US census, 1840, Reel 0384, Image 355, line 18, [Internet_Archive].
 Brown County Ohio marriages E5-345, [FamilySearch_Image].
 FamilySearch.org, US census, 1850, [FamilySearch_Record].
 Beech Forest Chapter, DAR, Monument Inscriptions prior to 1900 from Cemeteries in Clermont County Ohio, Vol. 4 (1952), 1.
 Ohio death certificate, [FamilySearch_Image].