American Opera Company was created in 1937.
American Light Opera Company was created in 1960.
Berkshire Opera Company ended in 2009.
Philadelphia Opera Company ended in 1910.
Opera Company of Boston ended in 1990.
Beecham Opera Company ended in 1920.
Aborn Opera Company ended in 1922.
Chicago Opera Company ended in 1946.
Boston Opera Company ended in 1915.
American Opera Society ended in 1970.
D'Oyly Carte Opera Company ended in 1982.
Philadelphia Civic Opera Company ended in 1930.