The Attorney General publishes
crime statistics for every city and county in California, over a ten year span of time.
CrimeMapping.com has developed a useful, if sobering, way to track reported criminal activity in specific, larger, cities. For example, this is the San Francisco map.
Since 1999, every lease or rental agreement for real property, or real property sales contracts for residential real property, must contain written notice that a prospective purchaser can access the data base containing information about registered sex offenders.
Not a pleasant topic, but it is important to understand how to access the online sex offender database called
Megan's Law, and what it contains. It is maintained by the California Attorney General. On entering the site one must first read and consent to a general Disclaimer.
There are seven search modes: by name, city, ZIP Code, or county; or within a predetermined radius of a selected address, park, or school.
There are pictures of every registrant, and most include addresses. The 'more info' link provides tabs for descriptions, offenses, scars/marks, and aliases.