- After Dinner Opera Co
- Bardavon 1869 Opera House
- Bel Canto Opera
- Bronx Opera Co
- Center For Contemporary Opera
- Center For Contemporary Opera
- Chautauqua Opera
- Cimarron Circuit Opera Co
- Cleveland Opera Marketing
- Delaware Valley Opera Corp
- Dicapo Opera Theater
- Eugene Opera
- Fargo Moorhead Opera Co
- Gilbert & Sullivan Players Inc
- Gilbert & Sullivan Players Inc
- Glens Falls Operetta Club
- Glimmerglass Opera
- Gotham Chamber Opera
- Gotham Chamber Opera
- II Piccolo Teatro Dell Opera
- II Piccolo Teatro Dell Opera
- Lake George Opera Festival
- Lake George Opera Festival
- Metropolitan Opera Guild
- Metropolitan Opera Guild
- Metropolitan Opera Guild Inc
- Metropolitan Opera Guild Inc
- New Rochelle Opera Inc
- New York Cantonese Opera Inc
- New York Grand Opera
- Obsidian Opera Co
- Ohio Lyric Theatre
- Opera Circle
- Opera Columbus
- Opera Providence
- Paul A Scarlata Inc
- Paul A Schaediger
- Paul A Schmid General Contract
- Paul A Schwarzbach DDS
- Paul A Stutman DDS
- Paul A Tanker
- Rogue Opera Assn
- Taconic Opera
- Tri-Cities Opera
