Yes, there is an 1855 census for Pickens County. Most pages are clear and readible, but some pages are not, so it is technically not "complete". There is no index for this census in book form. However, there *used* to be an online index for this census. I'm not sure where I came across that, and it is not listed on "Census online". You might try using a search engine to find it.

There's no online index for 1860 or 1870. If I get to the library next week, I'll look in the book indexes for you.