My Alexanders come from Warren Co. Ms. Robert Alexander, I know was my gggrandfather. There is a John in the 1830 cencus of Warren Co. with 2 other males between 25 and 30. In 1840 there are 3, Robert, Edwin and one that is unreadable that looks like Rev. to me. I don't know if they are the Alexanders you are looking for, but I do have a little more.