- Alabama Operaworks
- Alameda Civic Light Opera
- Arizona Opera Co
- Capitol Opera Sacremento
- Central City Opera
- Central City Opera House Assn
- Central City Opera House Assn
- Charmandhappy.Com Clowns
- Charmandhappy.Com Clowns
- Cinnabar Theater
- Connecticut Grand Opera
- Connecticut Grand Opera
- Denver Opera Co
- Dream Opera
- Emerald City Opera
- Festival Opera
- Fresno Grand Opera
- Golden Gate Opera
- Huntsville Opera Theater
- Livermore Valley Opera
- Long Beach Opera
- Los Angeles Eastern Teo Chew
- Mission City Opera & Vocal
- Mobile Opera
- Oakland Lyric Opera
- Opera A LA Carte
- Opera Birmingham
- Opera Colorado
- Opera Noir
- Opera Pacific
- Opera San Jose
- Opera Theater Of Connecticut
- Opera Theatre Of The Rockies
- Operaworks
- Orange County Opera
- Overtone Industries
- Palm Springs Opera Guild
- Pocket Opera Inc
- Riverside Little Opera
- Sacramento Opera Assn
- San Diego Opera
- San Francisco Opera
- Sierra Chamber Opera
- Sonoma City Opera
- Townsend Opera Players
- Washington Concert Opera
- Washington Opera Studio
- Washington Opera-Executive Ofc
- West Bay Opera
- West Coast Opera
