I am an agent in the greater Jackson, MS area. Yazoo county is included in the Jackson Multiple Listing Service area, I haven't heard of any other MLS provider servicing that area. I do not specialize in the Yazoo area, but would be glad to email you a list of the homes that are available in that area. If you would email me a list of your criteria, I could narrow the selections for you. My email is firstname.lastname@example.org.
Also, check out my website (listed below) and you can search for yourself.