See if your county has has GIS website. On the website they may have scans of old tax maps and such. They will also have modern tax maps which may show old lots. You should be able to google your county's GIS website. I believe GIS=Geographical Information System. It's where all the tax maps are stored in digital format. Also, try looking for old topo maps online. I was fortunate enough to find old topo maps (early 1900's) of my area which show where houses stood. If you see a house on the topo that you know now is just a wooded area then bingo you've got a possible hunting place.
Good Luck.
-Swartzie