I'm sorry that I can't positively identify where William D. belongs. As I said both Clemetius and his brother William had males born 1800-1810 in the early census's. It still seems likely with asmany children as William had that one of them would have been named William. Of course there is always the possibility that William had a son William who died young that there is no record of. I am 99% certain that one of these two men are the father of William D.
It's bad enough the number of different spellings there are in the Swearingen family without the insane misinterpretations or misspellings by census takers and county clerks. In doing my research I have used Ancestry.com whenever possible for census's just because you can do a soundex search. It sure beats doing a seperate search for each possible spelling or misspelling of Swearingen in each state. However even a soundex search won't catch every spelling. I found a whole group of Swearingens spelled Swerigen in the census that didn't show up in a soundex search for Swearingen. I never found William D. in the 1860 census. I have attempted to locate every Swearingen in the U.S. in the 1850 and 1860 census's. I have a stack of photocopied census pages approximately 2 inches tall just for 1850, and I know there are probably some I have missed due to misspellings or being unreadable. I also know that people were often missed by the census takers for a variety of reasons.
I welcome any information anyone is willing to share with me. I had intended to put out a book because there wasn't a good one out there. I had a copy of Karel Whytes book and was not impressed. Then I finally got a chance to see the final edition of her book (my copy was a 1992 edition) and found it to be the most accurate book ever witten by far about the Swearingen family. I may have some things she doen't have and I have most of what she has but I see no reason to produce a book until I have significantly more information than she has. I still have lots of information I have not entered into my family tree maker program, mainly personal information such as occupation or stories about them. Basically all I have at this point is names, dates, places, and children from Garret through 1860 and certain lines beyond 1860. My line is Branch 3, the branch with the most serious discreptancy in the family register, and the hardest to trace. I spite of proving the family register wrong, I still haven't been able to prove what's right in spite of tens of thousands of pages of photocopies of documents and pages from books and a fair amount of information sharing. It is only recently that I got online. Previously all my online research was done at the local library and much of it still is since I don't have Ancestry.com and the library does.