I live in a large city (4 million) and there is only 1 Nar-Anon meeting once a week in the city centre where I live (others in the suburbs and harder to get to).
I called the number for Al-Anon and asked about going to an Al-Anon meeting - there are lots of them, several each day.
The volunteer woman I spoke to said, "Oh no, Al-Anon is just for families of alcoholics. We don't have anything to do with drugs. You should find an appropriate Nar-Anon group."
It was so black and white, it was a real turn-off to even continuing to search. The categorical dismissal didn't give me a very positive impression of what I'd encounter.