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| O'BRIEN | . | . | US |
| O'CONNER | . | . | US |
| O'HARA | . | . | US |
| OAK | . | . | US |
| OAK | ABILENE | TEXAS | US |
| OAK | . | . | UK |
| OASIS | HIGHLAND PARK | MICHIGAN | US |
| ODEON | . | . | F |
| OFFICIAL | . | . | US |
| OH BOY | NASHVILLE | TENNESSEE | US |
| OKEH | NEW YORK | NEW YORK | US |
| OLD GOLD | . | . | UK |
| OLD HERITAGE | . | . | US |
| OLD HOMESTEAD | BRIGHTON | MICHIGAN | US |
| OLD TIMER | PHOENIX | ARIZONA | US |
| OLD TIMEY | . | . | US |
| OLD TOWN | NEW YORK | NEW YORK | US |
| OLDIES | . | . | US |
| OLIMPIC | COLUMBUS | OHIO | US |
| OLYMPIA | . | . | US |
| OLYMPIC | . | . | US |
| OLYMPIC | COLOMBUS | OHIO | US |
| OMEGA | . | . | US |
| OMEGA STUDIO | STRASBOURG | . | F |
| OMNI | . | . | US |
| OMS | DURHAM | CAROLINE DU NORD | US |
| ONE NUMBER ONE | . | . | F |
| ONE WAY | CORAL SPRINGS | FLORIDE | US |
| OPRYLAND | . | . | US |
| ORANGE | MOBILE | ALABAMA | US |
| ORBISON | . | . | US |
| ORBIT | HOLLYWOOD | CALIFORNIE | US |
| ORBIT | HUNTSVILLE | ALABAMA | US |
| ORBIT | DEKALB | TEXAS | US |
| ORBIT | ROCHESTER | NEW YORK | US |
| ORBIT | . | . | US |
| ORBIT SOUND | EUGENE | OREGON | US |
| ORCHARD | . | . | US |
| ORCHID | BRONX | NEW YORK | US |
| ORCHID | NEW YORK | NEW YORK | US |
| ORCHID | . | . | US |
| ORIGINAL | . | . | US |
| ORIGINAL JAZZ LIBRARY | . | . | US |
| ORIGINAL MASTERS | . | . | US |
| ORIGINAL SUN | . | . | US |
| ORO | MODESTO | CALIFORNIE | US |
| OSSIAN | . | . | US |
| OT | . | . | US |
| OTT | ARLINGTON | VIRGINIE | US |
| OUT OF TOWN | . | . | US |
| OVATION | . | . | US |
| OVERCOAT | . | . | US |
| OVERTURE | . | . | US |
| OXYGENE | . | . | F |
| OZAR MUSIC | . | . | US |
| OZARK | SOUTH GATE | CALIFORNIE | US |
| OZARK | SAULT SAINTE MARIE | MICHIGAN | US |
| OZARK | SAINT LOUIS | MISSOURI | US |
| OZARK | BAILEY | CAROLINE DU NORD | US |