heretic888
Senior Master
Just because Takamtsu's art was made public and grew rapidly due to (I think) SKH, do not discount those "ninja" family arts that still exhist but continue to maintain a low profile.
Oddly enough, none of these "ninja family arts" can demonstrate a solid link to Japan.

Also Saito Ninjitsu, a family art taught by the Saito Family, was first taught publicly in 1966. Autumn Moon Temple
I hate to break this to you, but Saito doesn't claim that their martial art is a "ninja" tradition. Just the opposite, actually.
Also with all the actual lack of historical evidence, documentation and controversy surrounding all claims (even Hatsumi Densho) by those of Ninpo and "Ninja" arts
Uhhh.... right.
is rather hard to say exactly how many "ninja" Clans actually exhisted.
If you are referring to specific familial clans and not ryuha, then the generally accepted numbers are 45 clans of Iga and 53 clans of Koga.
Not to mention that there are some koryu arts that have ninjutsu ryuha within their bujutsu.
I hate to break this to you, but that doesn't make those koryu "ninja arts" nor does it mean they contain Ninpo.
Laterz.