Williamson County Mortgage Record Books U thru Z have been completely indexed now and have been added to our Master Mortgage Record Book Index. Most of these mortgage records tend to run from the last years of the 1800’s into the first two years of the 1900’s. We are now starting to index books 1 thru 48, which will be released in blocks of four books at a time. To view the Master Mortgage Record Book Index, click on this link.