| Org. A.E.S. belonged to | 23 |
| Org. "protecting America's consumers" | 51 |
| Org. "formed" inside the four longest answers | 55 |
| Org. | 4 |
| Org alternative | 15 |
| Orff's "___ Burana" | 33 |
| Orfeo, e.g., in Gluck's "Orfeo ed Euridice" | 57 |
| Orfeo's orecchio | 20 |
| Orfe | 4 |
| Orfant Annie's creator | 26 |
| Orestes, to Agamemnon | 21 |
| Orestes's sister and others | 31 |
| Orestes' tormentors | 23 |
| Ores | 4 |
| Oreo, for one | 13 |
| Oreo's filling | 18 |
| Oreo's center | 17 |
| Oreo morpheme | 13 |
| Oreo maker | 10 |
| Oreo innards | 12 |
| Oreo flavor | 11 |
| Oreo fillings | 13 |
| Oreo filling | 12 |
| Oreo filler | 11 |
| Oreo center | 11 |
| Oreo and milk action | 20 |
| Oreo alternative | 16 |
| Orenburg's river | 20 |
| Orenburg is on it | 17 |
| Orem's state | 16 |
| Orem's place | 16 |
| Orem's home | 15 |
| Orem site | 9 |
| Orem native | 11 |
| Orem locale | 11 |
| Orem is here | 12 |
| Orel's stream | 17 |
| Orel's river | 16 |
| Orel refusals | 13 |
| Orel money | 10 |
| Orel Hershiser e.g. | 20 |
| Orejón, e.g. | 15 |
| Oregonian biologist | 19 |
| Oregonian | 9 |
| Oregon’s “Emerald City” | 35 |
| Oregon-to-New York direction | 28 |
| Oregon-based tea brand | 22 |
| Oregon-based shoe company | 25 |
| Oregon, to Yves | 15 |
| Oregon, since 1992 | 18 |
| Oregon, once: Abbr. | 19 |
| Oregon, for one | 15 |
| Oregon's _____ Lake | 23 |
| Oregon's ___ Lake | 21 |
| Oregon's ___ Bay | 20 |
| Oregon's state tree, for one | 32 |
| Oregon's state tree | 23 |
| Oregon's Life at These ___ | 30 |
| Oregon's largest city | 25 |
| Oregon's Douglas fir, e.g. | 30 |
| Oregon's capital | 20 |
| Oregon ___ | 10 |
| Oregon __ | 9 |
| Oregon workplaces | 17 |
| Oregon wind | 11 |
| Oregon volcano | 14 |
| Oregon Treaty president | 23 |
| Oregon Trail VIP | 16 |
| Oregon Trail vehicle | 20 |
| Oregon Trail traveler, e.g. | 27 |
| Oregon Trail transportation | 27 |
| Oregon Trail transport | 22 |
| Oregon Trail team | 17 |
| Oregon Trail state | 18 |
| Oregon Trail sight | 18 |
| Oregon Trail river | 18 |
| Oregon Trail fort | 17 |
| Oregon Trail figure | 19 |
| Oregon Trail driver | 19 |
| Oregon Trail city | 17 |
| Oregon State's conf. | 24 |
| Oregon State squad | 18 |
| Oregon State running back who was the Pac-10 Offensive Player of the Year | 73 |
| Oregon State mascot | 19 |
| Oregon State city | 17 |
| Oregon Shakespeare Festival locale | 34 |
| Oregon senator Wyden | 20 |
| Oregon senator who resigned in 1995 over sexual harassment charges | 66 |
| Oregon senator Ron | 18 |
| Oregon seaport | 14 |
| Oregon river or bay | 19 |
| Oregon river | 12 |
| Oregon port city | 16 |
| Oregon peak | 11 |
| Oregon or Sante Fe | 18 |
| Oregon or Santa Fe: Abbr. | 25 |
| Oregon or Santa Fe | 18 |
| Oregon or Overland | 18 |
| Oregon or Oklahoma | 18 |
| Oregon or New York | 18 |