The first map drawn was as of 1810:
Based upon a deed I located for Augusta Newman in Nicholas County, his property was originally in Bourbon, but was in Nicholas County after the move. The area that changed from Bourbon to Nicholas County was fairly small, but since Newman's property was in the moved area, it helps me to pinpoint where his farm was located.
It is indicated that border changes are discussed in the Kentucky Acts of 1816-1817. I've found this item on WorldCat and am trying to obtain a copy on interlibary loan. Stay tuned.
We'll have a brief blog post when I get the Kentucky Acts of 1816-1817 and will follow up with a more detailed discussion in a future issue of Casefile Clues.