The only way to find out who lived in Green Co in 1800 is basically through land and/or taxation records. In 1790 you had CT, ME, MD, MA, NH, NY, PA, RI, SC and VT and some of VA that had a census. No schedules were known to exist for DE, GA, KY, NJ, TN and VA in 1790 as they were burned during the British attack on Washington durin the War of 1812. You could find bits and pieces, but that would be it. None for KY in 1800. This could be because KY wasn't a state until 1792, it was VA. And even after it became a state, some of counties like Green, Logan, Christian, Warren and some of those other more southern counties could of been under TN. Read up on the Walker Line and what was KY and what was consider TN. Even some of our ancestors perhaps didn't know that they were in KY, or in TN. It was confusing for many years and that could account for why someone might say they were born in VA in 1791 when in 1792 they were sitting slap dab in the middle of KY and were really born there. Therefore it doesn't go without saying that someone born in KY didn't think they were born in TN or visa versa during the Walker Line problems. Darn those surveyors. Anyway, there was some Isaac/Isaacks in KY in 1810. Unless someone does it before me, I can look at our 1810 Federal Census Index at our Family History Center here. Come back to this site next week and I'll be a good girl and do my work 'next time'.