Prototype Light Observation Helicopter for US Army competition. Lost to Hughes OH-6 Cayuse. Bell developed into civil 206 and the rest is history. 
List of Operators of Bell D-250 / YHO-4 | |
| From | Organisation with model D-250 / YHO-4 | |||||
| 1968 |
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| Construction Numbers on database of D-250 / YHO-4 | ||||||
| ||||||
Construction Numbers | Help Us | |
| C/N | Year | History | |
| 4 | 1962 |  62-4202 | |
| 5 | 1962 | 62-4203 | |
| 6 | 1963 | 62-4204,N51HP,N532NA | |
| 7 | 1963 | 62-4205 | |
| 8 | 1963 | 62-4206 |