| OBRIEN 1920 -1940s | Grant County | |
| O'BEIRNE | Santa Fe | |
| OCHOA | Dona Ana | |
|
OLDFIELD |
Union | |
| OLDHAM | San Miguel | |
| OLIVARES | Valencia | |
| OLSEN | Quay | |
| ORNELAS | Grant | |
|
ORTEGA |
Lincoln | |
| ORTEGA | Mora | |
| ORTEGA | San Miguel | |
| ORTEGA | San Miguel | |
| ORTEGA | Santa Fe | |
| ORTEGA | Lincoln | |
| ORTEGA | Lincoln | |
| ORTEGA | Lincoln | |
| ORTEGA | Otero | |
| OTERO | Cibola | |
| OTERO | Valencia | |
| ORTHOFER | Bernalillo | |
| ORTIZ | Bernalillo | |
| ORTIZ | Lincoln | |
| ORTIZ | Lincoln | |
| ORTIZ | Lincoln | |
| ORTIZ | Rio Arriba | |
| ORTIZ | San Miguel | |
| ORTIZ | San Miguel | |
| ORTIZ | San Miguel | |
| ORTIZ | Santa Fe | |
| ORTIZ | Santa Fe | |
| ORTIZ | Taos | |
| OWEN | Quay | |
| OWEN | Curry | |
| OWENS | state-wide | |
| updated | IJF | 12/30/05 |