How to find a preschool in San Francisco

Hi,

My daughter is currently 14 months and I was told that I should start looking for preschool. We live in south side of the city and I wonder if other parents have any recommendation on how to start the search? Do I have to look for preschool only in the city or I can look in Daly City, South SF, or other nearby cities? I'm open to either public or private and I am hoping I can find a centralized website with all preschools available and narrow down my searches. Any recommendation is welcome. Thank you.