"I am soooooooooo stuck on my Hanlon line. John & his sister Margaret apparently just showed up one day in the 1850s from somewhere in Ireland. I've even had a male cousin test his dna, I've done my own Family Finder dna test at FamilyTreeDNA.com....but alas, no answers!"
So, in addition to searching for obituaries of Hanlons prior to 1900, I thought, why not look for marriages as well? Today I searched all the Iowa newspapers published by NewspaperArchive.com for my Hanlon family names of James, John, Thomas and Tom, Francis and Frank, Mary, Catherine, Margaret and Ellen.
Unfortunately, I could find no mention of any Hanlon getting married in IOWA in any of the Iowa newspapers prior to 1900, but did find this announcement of a Hanlon wedding from New York in the Palo Alto Reporter, Palo Alto, Iowa, September 6, 1900: