I know this is kind of late, but ... I started out Googling. CPMs are legally allowed to attend homebirths in my state, so those are the ones I found first. I contacted one, and she wasn't taking patients, but she referred me to a CNM who lives within an hour of me. Once you have a contact in the profession, it's easier to find others who may be practicing under the radar.
Our first midwife didn't end up working out, and we are currently looking for a new midwife. I have had good luck with contacting the [State] Midwives Association (sorry for being so cryptic; we are keeping our homebirth a secret until after the fact). They list a few midwives on their website, and we got the names for several others (CPMs) by e-mailing the contact people listed there. If you live is a state where CPMs are illegal/alegal, some may seem reluctant to talk to you at first. I think you just need to assure them that you are serious about having a homebirth and not trying to spy on them, and then they are very helpful.
There is also a homebirth support group that meets monthly in our state capitol. I haven't attended a meeting, but I follow them on Facebook. That might be another way to find a midwife.
Good luck with your search!
Follow Mothering