Jerry- you can get the plat map and any recorded surveys from the County Courthouse. Tax maps are not very reliable and the best way to know for sure would be for a survey to be conducted as Dan suggested. If you are working with a Realtor, which I highly recommend, see if they can get you the plat map and previous surveys. Most Realtors, myself included, have online access to courthouse records to get the maps for Bartow County. Hope this helps.
Nothing short of a survey will be reliable. There are some map overlays that show the shape of the lot superimposed over an aerial view of the property, but those line are approximate and not guaranteed.