Hi Shannon, I am also looking for kin in Greene County, Ohio. I recently found some information on the familysearch.org site that you'd be interested in. Mary Koogler, born April 19, 1808 in Greene County; died December 1, 1887. Father Jacob Kugler, mother Kinla Harner. Mary married a man named Robert Black on June 11, 1826 in Greene, County, she was 18, he was 19. You can also find her as Mary Kooglar.
I am trying to determine if the people of the marriage of Mary Cooglar and William R. Hollis are my ancestors (also found as Mary Kooglar and William Hollins). They were married July 21, 1822 in Greene County, Ohio. I've been researching the Hollis'. There was a submitter's name for my info, Richard Koogler, found one in Illinois and have tried to make contact but no response yet, may not be the same person, I found him at a different address, submitter's info was from 1997.
There were a whole bunch of Ohio Kooglers on that site with various spellings.