There are 11 attractions at Islands of Adventure with height requirements:

Height Requirements at Islands of Adventure
Attraction Height Requirement
Pteranodon Flyers 36"
Flight of the Hippogriff 36"
The High in the Sky Seuss Trolley Train Ride! 40"
The Amazing Adventures of Spider-Man 40"
Popeye & Bluto's Bilge-Rat Barges 42"
Jurassic Park River Adventure 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