I've been doing research on my own family which happens to include a branch with the Clemons family. My Great-grandfather was William Clemons Grewell (1890-1966), Son of Mariah Elizabeth Clemons (1850-1930) and Albert Barrett Grewell. Mariah was the daughter of Nancy Jane Elder (1820-1900) and William Mathis Clemons (1815-1900). William was the son of Mary Mathis and William T. Clemons.
The Elder family was also mentioned in the post I'm responding to. Nancy Jane Elder Clemons was the daughter of Sarah Bentey and James Elder,Sr.
My research is based on two sources: The Clemons cemetary records of Marshall County, Iowa found on the internet and a family bible my grandmother passed to my mother. As I recall from the family bible, the family moved to Iowa from Indiana by way of Illinois. I'm intested if there is any connection and any records going back further for this branch of the family.
My grandmother was invited to a centennial celebration of Clemons, Iowa because she was somehow related to the community's founder but I don't know who that person is. Her parents were buried in the Clemons Cemetary.