Current breakdown at the time of this post sorted by the number of active users:

1. lemmy.world: 101,013 users
2. lemmy.ml: 41,972 users
3. beehaw.org: 12,270 users
4. sh.itjust.works: 17,509 users
5. feddit.de: 8,675 users
6. lemm.ee: 10,348 users
7. lemmynsfw.com: 22,967 users
8. lemmy.fmhy.ml: 8,777 users
9. lemmy.ca: 5,072 users
10. programming.dev: 5,058 users

Source: https://the-federation.info/platform/73