Alabama Department of Archives and History (ADAH)
From Ancestry.com Wiki
624 Washington St.
Montgomery, AL 36130
Military and state census records are housed at this repository in addition to most copies of county materials on microfilm. The library’s reference room provides family histories and papers, the state’s most inclusive collection of Alabama newspapers and books, and a card index to the part of their collection that is cataloged. The website has an excellent group of databases for online researching.