The Yuba County, California Sheriff has added a Sex Offender Registry which allows a search by address, name - or partial first or last name - returning a list of all registered Yuba County sex offenders. Then get an email alert when a sex offender registers with the Yuba County Sheriff’s Office who lives within a one-mile radius of the selected address - only within Yuba County.
Search results include a photo, description of the offense, the offender’s registration status, address and map of the location.
Tehama County, California now has a sex offender mapping and alert service, and is utilizing the same software as the Yuba County site. Perhaps this is going to be a service that the county Sheriff’s begin to offer on a more widespread basis. Tehama Sheriff sex offender search: http://watchsystems.com/ca/tehama/