In the hospital, pretty much none. Midwives work in triage, but they aren't allowed (by the hospitals) to deliver babies.
Out of hospital, CPMs are now able to practice legally, and there's one (Dana) who advertises.http://www.friendsofmomidwives.org
has more resources. We have meetings in St Charles and St Louis, where you can meet other midwifery supporters and learn more about homebirth in St. Louis.