"New York, New York City Marriage Records, 1829-1938", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:24QB-NT5 : 20 June 2023), Warren McCord in entry for Henry Belcher Wheatcroft, Jr. and Ora Florine McCord, 1918.
"Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X2YN-LL6 : 19 February 2021), Warren Mccord and Hattie E Price, 1881; citing Bond, Illinois, United States, county offices, Illinois; FHL microfilm 1,317,524.
"Illinois, County Marriages, 1810-1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X2RN-THV : 19 February 2021), Warren Mccord and Hattie E Price, 1881; citing Bond, Illinois, United States, county offices, Illinois; FHL microfilm 1,317,523.
Research notes
There appears to have been another Harriet married to a Warren McCord, it's confusing, but I'm pretty sure they are different familes due to location and surnames.
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DNA Connections
It may be possible to confirm family relationships with Warren by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: