Here are all the known warp zone locations in Super Meat Boy! Some of these warp zones include bandages. Check out the list of all bandages in Super Meat Boy.
A-BX, where A is the chapter, B is the level number and X indicates the warp zone is in the dark world version of the level.
1-5: Holy Mountain – Warp Zone (Sky Pup)
1-12: Revolve – Warp Zone (The Commander)
1-19: Intermission – Warp Zone (Hand Held Hack)
1-13X: Tommy’s Condo – Warp Zone (Space Boy)
2-8: The Sabbath – Warp Zone (The Bootlicker)
2-12: Above – Warp Zone (Castle Crashers)
2-15: Gallbladder – Warp Zone (The Blood Shed)
2-5X: Agent Orange – Warp Zone (1977)
3-5: Uptown – Warp Zone (Cartridge Dump)
3-7: Mind the Gap – Warp Zone (Tunnel Vision)
3-16: Mono – Warp Zone (Ogmo)
3-8X: Salt Crown – Warp Zone (Kontra)
4-8: – Warp Zone (Brimstone) – Thanks to xXCanadian JrXx and ecamirG for this one.
4-14: Adversary – Warp Zone (The Key Master)
4-18: Boris – Warp Zone (The Fly Guy)
4-7X: Thistle – Warp Zone (MMMMMM)
5-1: The Witness – Warp Zone (The Skyscraper)
5-7: The Fallen – Warp Zone (The Guy!)
5-12: 10 Horns - Warp Zone (Sunshine Island)
5-20X: Quietus – Warp Zone (Meat is Death)