The South Carolina Encylopedia will tell you everything you ever wanted to know about the state. They have a great website at
http://www.scencyclopedia.org/


Not being from South Carolina, I loved Walter Edgar's
South Carolina: A History 
book. I have read it and listened to it on audiobook several times. It is really a great history. The audio book includes additional information from the author who is a professor at the University of South Carolina (USC) and probably the foremost expert on South Carolina history.
By the time I finished reading and listening to it, I felt like I knew more about the state than many life long residents.
The Encyclopedia
, edited by Professor Edgar tells you something about every county and almost every town in the Palmetto State. The articles are short and to the point. It really is like reading an encyclopedia. The website shows some sample listings to give you an idea of what the book is all about.
The book is not inexpensive, but it is worth the investment if you live in South Carolina, or are just a history buff interested in the state. I'd recommend it to anyone.