Searching for Places and People Before the Following on Family Tree Particularly the Irish Roots

Starting with my father's paternal grandparents and going as far as I know up to this point:
John Leonard Powers m. Euna May Humphrey

John Leonard Powers - born to John Lewis Powers and Ellen Marnetta Sanderson in 1892. near Mellwood, Arkansas

Euna May Humphrey - born to George Thomas Humphrey and Sarah Hart in 1901. Paducan, Kentucky

John Lewis Powers - born to unkown in 1853 somewhere in Ireland.

Ellen Marnetta Sanderson - born to Henry Jacob Sanderson and Angeline Armstrong in 1856. St. Paul, Minnesota

George Thomas Humphrey - born to Charles M. Humphrey and Margaret Melissa Thomas in 1870. Clarksville, Tennessee

Sarah Frances Hart - born to Samuel Hart and Louisa Lane in 1881. Paducah, Kentucky

As for my father's mother's side . . . I only know her parents' names:
Richard Huggins m. Minnie Mae Boyle