Originally Posted by redrosetea
I haven't been able to get a number from the net. I keep hearing about orders I never knew existed
There's an old joke about things God doesn't know:
1. How many congregations of religious women are there?
2. How much money do the Franciscans have stashed away?
3. What are the Jesuits going to do next?
So I'm not sure you're going to find a good answer.
(Center for Applied Research in the Apostolate) gives some numbers for the US
Religious priests: 12,966
Religious brothers: 5,001
Religious sisters: 59,208
(And I just realized you asked about the number of congregations, not the number of members. Ah well, maybe someone else will have a number.)