I ran across this the other day — in 1859, there were 278 Orthodox bishops in the world:
|Constantinople (including Romania, Bulgaria, and part of Serbia)||136|
|Russia (including Georgia)||65|
|Austria (now Serbia, mostly)||11|
Source: J.M. Neale, trans., Voices from the East: Documents on the Present State and Working of the Oriental Church (London: Joseph Masters, 1859). Google Books has the whole thing available for free. If you go there and find those numbers, they’ll look a bit different, because I added in the four patriarchs at the time (Constantinople, Alexandria, Antioch, and Jerusalem).