Hi Pat, Looking at my copy of "Map Guide to the U.S. Federal Censuses, 1790-1920", it appears that it is entirely possible that your family could have been living on the same piece of land during the years you mentioned. There is a portion of land that was part of those counties as the boundaries changed. This book only shows the boundary changes every ten years, however. So, you might want to look at the changes for the in-between years in order to find out if there was another county involved. Hope this helps a little. Leslie Bridges Kohler Glendale, Arizona ---- Pat Frunzi <patfrunzi@comcast.net> wrote: I have spent many hours at the Family History Center looking through tax lists from 1800-1815, and I have a strange question about the changing boundary lines of counties in KY. My family was in Madison Co., KY, in 1801. Then they disappear and show up in Clay Co., KY in 1807, and a little later in Estill Co., KY. At first I thought they were probably on the same land and just the boundary lines changed. But, where were they in 1802, 1803, 1804, 1805, and 1806? They are not in Madison, Clay, or Estill. Is there another county I should look at? Thanks for any clues, Pat Hagan Frunzi Fallsington, PA