Hi, Roger - you should be able to get a pretty good count of German Mudcatters from the German Mudcatter Get-Together thread. I don't have a way to search the registration by place name, so I can't give you a number from registration. As I recall, we have some 5,000 registrations, but there are some guilty parties around here who have multiple registrations, for Lord knows what reason.
I do have to say that I question the wisdom of setting up one thread for each nation. I suppose you'll do what you want, but it looks like clutter to me.
-Joe Offer-