There is no 100% reliability. There are estimated saying 13.3 million, others say 14.6 million.
Israel will be for the first time bigger than the Jewish diaspora next year.
The biggest Jewish communities in the world:
USA 5.3 million
France 700,000
Canada 350,000
UK 300,000
Russia 250,000
Germany 180,000
Argentina 130,000 (from more than 400,000 several decades ago!)
Australia 120,000
Brazil 96,000
The biggest Jewish community in a Muslim country is that of Iran: 16,000, followed by Turkey 12,000 (was nearly 30,000 in the 1990ies!)...
Number taken from a book about religions.