Cycling in Sydney Australia
Closing in on 3000 members. Newtown still on top with 75 members, but if you take the whole Leichhardt LGA (Balmain, Rozelle, Annandale etc) as one they have 94 members. Marrickville is on 50, Bondi and Bondi Junction have 59. City of Sydney would probably win if you include all the "villages", Surry Hills, redfern, Pyrmont , half of Newtown etc.
The GoogleMap I made is open to all collaborators so if anyone wants to collaborate (ie update numbers for suburbs in your area) let me know. I guess I just add you as a collaborator and away you go.