I checked the number of active listings and this is what it shows:
1. US site: over 739.000 listings !!!
2. UK site: over 696.000 listings
3. CA site: over 595.000 listings
4. AU site: over 584.000 listings
5. IE site: over 554.000 listings
I didn't check others, but I think that these are the three largest ones. Yay !!!