"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M85G-FNF : 4 April 2020), Mary J Ohair in household of John W Ohair, Edgar, Edgar, Illinois, United States; citing family 1335, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KFK6-TVB : 4 November 2017), John W. Ohair and Mary J. Dillman, 08 Dec 1847; citing Edgar, Illinois, United States, county offices, Illinois; FHL microfilm 1,301,880.
From spouse's findagrave site: Find a Grave, database and images (accessed 31 July 2020), memorial page for John Western “Jack” O'Hair (26 Jan 1824–16 Oct 1905), Find A Grave: Memorial #92897156, citing Edgar Cemetery, Paris, Edgar County, Illinois, USA ; Maintained by John Reckel (contributor 47910796) .