| Designation | Modified Role | Location | Serial / Regist. |
|---|
| YH-21 | | | |
| CH-21A |
Transport | | |
| H-21A (CH-21A) | | | |
| H-21B (CH-21B) | |
March Field Air Museum Riverside, California | 53-4326 |
| | |
Travis Air Force Museum Travis AFB, California | 52-8688 |
| SH-21B |
Search and Rescue | | |
| CH-21B |
Transport |
Museum of Alaska Transportation & Industry Wasilla, Alaska | |
| | |
Museum of Aviation Warner Robins AFB, Georgia | 52-8685 |
| | |
National Atomic Museum Kirtland AFB, New Mexico | 52-8691 |
| | |
Strategic Air Command Museum Ashland, Nebraska | 52-8676 |
| | |
USS Alabama Battleship Memorial Park Mobile, Alabama | 51-15859 |
| | |
United States Air Force Museum Wright-Patterson, Ohio | 51-15857 |
| | |
United States Army Aviation Museum Ozark, Alabama | 53-4369 |
| H-21C (CH-21C) | |
Hill Aerospace Museum Hill AFB, Utah | 56-2142 |
| | |
Wings Over The Rockies Aviation & Space Museum Denver, Colorado | 55-4218 |
| CH-21C |
Transport |
American Helicopter Museum West Chester, Pennsylvania | 55-4140 |
| | |
Intrepid Sea-Air-Space Museum New York, New York | 55-4140 |
| | |
Pima Air & Space Museum Tucson, Arizona | 56-2159 |
| | |
Quonset Air Museum North Kingston, Rhode Island | 51-15892 |
| | |
United States Army Aviation Museum Ozark, Alabama | 56-2040 |
| H-21D | | | |
