Yes, that's been my experience in every atheist/humanist meetup or discussion board I've participated in anyway.

I am male.

In my experience, women are less likely to identify as atheist for social reasons, and so tend to be under-reported. My wife for example meets the definition completely but resists the label due to the negative connotations she feels it has. It's not a social signal she wants to send, or a way that she wants to portray herself.

As the member list here will show you though, there are plenty of female unbelievers.

It’s always appeared to me there are… My assumption has been, women are more accustomed to accepting shit they don’t like than men. Women (appear to) view atheism as just one more battle they’d have to fight, and (likely) feel they’re fighting too many already.. Men fight, and the best are willing to spend some of their ‘capital’ fighting for justice.

Obviously, to me at least, more women are beginning to feel and exert that same strength. I’ll welcome them ...while wishing they’d have shown their heads in my days of hay ~

According to Pew double: [pewforum.org]

Yeah, my anecdotal experiences say there are more male atheists.

I've generally felt I could get a mate if I was willing to go to church. My ex GF had a dozen single LDS women friends just pining for a man who follows Gawd.

I know several educated, professional, mostly rational women who wished I was religious.