The authoritative treatise on researching the law of the local level of government in the United Stated of America.
A print copy updated through 2015 is available as well.
There are no longer municipal courts in California, so while there are California and Federal courts in San Diego County, there is no longer a San Diego Municipal Court.
The County of San Diego's web site includes hyperlinks to the different county districts as well as an "I want to..." drop-down menu that lets you report issues like road problems, noise, and even suspected child abuse.
San Diego County's Public Law Library for legal professionals and members of the public who seek legal information. The library's list of legal databases provides access to Lexis to users in the library and to Nolo Press self-help law books on a variety of topics to users even while not in the library. Their research and motion guides have instructions on how to do certain kinds of legal research and general motion templates that you can use.