Stanford APDA  maintains a roster of Parkinson's disease support groups in San Francisco, Peninsula, East Bay, North Bay, South Bay, Santa Cruz, Monterey,
Central Coast, Central Valley and the Tahoe/Truckee area. 

While some groups listed by Stanford are PANC affiliated groups, only those listed on
PANC's website under Support Groups and Carepartner Support Groups are
covered by PANC's liability insurance, policies, and services.

PD Support Groups
Caregiver only Support Groups

Online Support Group Forums
With online support group forums, comments or questions are posted to a message board and replies from other group members trickle in over hours or days. Members can post and read messages posted by other members at any time of the day or night. 
Some groups have a moderator to 'police' the posts, others do not. 

Video Support Groups -- National and International
Video Support Groups use videoconferencing for meetings.  Meetings are at a specific time on a regular schedule (weekly or monthly). The video support groups listed here are for people with PD as well as caregivers. There's a wide variety options available.