Mary Polly Hinton and Bridgers O'Neal were married in Johnston County, North Carolina on 29 August 1798. 
She passed away in 1840.
↑ "North Carolina Marriages, 1759-1979," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F8YJ-84Y : 10 February 2018), Bridgers Oneil and Polly Hinton, 29 Aug 1798; citing Johnston,North Carolina, reference ; FHL microfilm 6,330,313.
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHB4-WJW : 24 August 2015), Bridges Oneal, Marengo, Alabama, United States; citing p. 61, NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.), roll 9; FHL microfilm 2,334.
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It may be possible to confirm family relationships with Polly by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Polly: