Karen,
In the census, I find a Kinnison Kennison and Mary Kinnison a number of times in the early 1800's but not in the time frame you need.

In 2 or 3 public family trees on Ancestry.com, I find a
James Enos Thomas b. 1751 in Fredrick, Va. M. Mary Kinnison in 1789(38 years of age) in Neson, Ky.

James Enos Thomas died at age 83 in Grayson, Ky. His wife was Mary Kinnison.
Sorry I can't find more for you today.

Sue