Chicago Opera Theater was created in 1974.
Chicago Opera Company was created in 1940.
Chicago Opera Association was created in 1915.
Chicago Civic Opera was created in 1922.
Lyric Opera of Chicago was created in 1929.
Chicago City Opera Company was created in 1935.
Lithuanian Opera Company of Chicago was created in 1956.
Chicago Grand Opera Company was created in 1910.
At the Opera House was created in 1958.
McMinnville Opera House was created in 1888.
Earlville Opera House was created in 1890.
Abay Opera House was created in 1934.