Anonymous wrote:20:44 here. Most of the suggestions are on grade level. You can look them up on Scholastic. Holes & Hoot are slightly older--grades 5-8. Those I read as an adult. I did read To Kill a Mocking Bird and All Creatures Great and Small in 4th grade, but yes, "technically" their reading levels are h.s. Harry Potter is pretty graphic in nature, just not as well written so I guess people don't object to that suggestion.
Phantom Tollbooth Reading Level Grade Level 3-5
http://www.scholastic.com/teachers/book/phantom-tollbooth
(And PP, stuff it about kids not getting the humor. You've repeated this comment ad nauseam. Some kids won't but lots do.)