you can do a search for child care places at www.4c.org
it is the child care referral service for santa clara county. in your search options, you can specify city and that you want a co-op (parent participation). you need to create an account to do an online search of the child care places in 4c.org.
or you can look at www.naeyc.org, search for naeyc accredited places (find "families" in the left hand menu, and you should be able to find some kind of search function). i highly suggest a naeyc accredited place, after looking at various options. the places should be obvious by the name of the school "parent preschool", "co-op nursery", etc.