American Opera Company was created in 1937.
American Light Opera Company was created in 1960.
Chicago Opera Company ended in 1946.
Boston Opera Company ended in 1915.
Berkshire Opera Company ended in 2009.
Philadelphia Opera Company ended in 1910.
Beecham Opera Company ended in 1920.
Opera Company of Boston ended in 1990.
Aborn Opera Company ended in 1922.
American Opera Society ended in 1970.
San Carlo Opera Company ended in 1909.
Chicago City Opera Company ended in 1939.