There are 12 attractions at Islands of Adventure with height requirements:

Height Requirements at Islands of Adventure
Attraction Height Requirement
Flight of the Hippogriff 36"
The Cat in the Hat 36"
Pteranodon Flyers 36"
The Amazing Adventures of Spider-Man 40"
The High in the Sky Seuss Trolley Train Ride! 40"
Jurassic Park River Adventure 42"
Popeye & Bluto's Bilge-Rat Barges 42"
Dudley Do-Right's Ripsaw Falls 44"
Harry Potter and the Forbidden Journey 48"
Doctor Doom's Fearfall 52"
Dragon Challenge 54"
The Incredible Hulk Coaster 54"

Height Requirements at Other Parks