It depends on your demographic. For example, on b-f sites, it won't be a very fruitful place to look, but I'm sure (in fact I know) there are a smattering.
try facebook if there is no local group.
for example
https://www.facebook.com/groups/butch2butch/
https://www.facebook.com/pages/Butch...65825846769286
if you are kinky try fet life, there are groups for butch-butch and for trans-butch and cismen-butch. I did belong to a "butch women admirers" on fet life, but eventually I realised it was for CIS dudes into butch women, mostly, so I left the space to them.
But fetlife is another good angle as well.
similarly, try google plus, craiglist for more groups or events and OK cupid for those who like butches or "masculine energy" or "masculine vibe queers" etc.
You could always put an add up here somewhere.... though I suppose you just did
good luck.