Be advised that the index on Ancestry for the 1850 census for Benton Co, AL is not functional. If you type in a name in the search function without listing Benton Co as the location and that individual is in Benton Co, the name will be listed with Benton Co as the location. But if you search for anyone and list Benton Co as the location they will not be shown in a usable manner.
Ancestry file for Benton Co broken into 4 districts:
District 28- 128 images 64 pages: page 263A-327B
Jacksonville- 10 images 5 pages: 328A-332B
Subdivision 29-118 images 59 pages: 333A-391B
Subdivision 30-66 images 33 pages: 392A-457B
Last name indexes can be found on censusonline.com and censusfinder.com