Cairo Opera House was created in 1988.
Paris Opera Ballet was created in 1669.
Moldova National Opera Ballet was created in 1980.
Your answer depends totally on the size of the opera company. Further, it depends on whether the company includes -- or not -- the opera ballet, the opera chorus, the opera orchestra, the opera production company and crew, the administration for the company, and so forth.
an opera ballet is an opera that incorporates ballet dancing in part to tell the story of the opera
an Opera Ballet is an opera that incorporates ballet dancing in part to tell the story of the opera
Staatsballett Berlin is the one and same Berlin States Ballet. Staatsoper equates to States Opera.
Century Opera Company was created in 1913.
Philadelphia Opera Company was created in 1938.
Boston Opera Company was created in 1908.
Canadian Opera Company was created in 1950.
Chicago Opera Company was created in 1940.