What colleges offer a certificate program in Southern California

I suspect all do....

In the program you desire is the question.   Can't tell you that since you have not given us much on what you may wish to pursue your certificate in.

SolidWorks is a tool, among many tools/skills a particular certificate program teaches you.

Also tell us where in Southern California you are located?  That will help us give you a better answer to your question.

You mean 2 yrs college ?

if so, then you would have option to have AA certificate (2yrs) and transfer all units to a 4 yrs program in any university

Glendale Community College : Computer Aided Design

http://www.lasc.edu/students/classes-areas-of-study/2015%202016%20LASC%20Catalog.pdf  - see page 75

What kind of "Certificate" are you wanting?

Colleges offer "Degrees" such as Associates, Bachelors, Masters..

There are also "Certificates" for completing certain courses or requirements that can be anywhere from learning a simple task that will take a few hours to learning and mastering a field of study (like Air Conditioner repair, or Automotive repair...) or a software package (like SolidWorks). 

I am assuming, since you asked on the SolidWorks Forum site, that you want some level of training or certification in SolidWorks.

You can take classes to learn the subject at a college and may get a certification from them. - Many on them will have you get a SolidWorks Certification (From SolidWorks) as part of the coarse. In that case, you would take one of the Solidworks Certification tests - from SolidWorks for CSWA, (certified SolidWorks Associate) CSWP, CSWE and other more specific certifications. 

What exactly are you wanting to achieve?

I think I heard that Mt. San Antonio College and Santa Ana College have a program to get students CSWAs.

Most college courses are going to  scratch the surface, it takes practice to get good at using Solidworks.  The key is to learn the basics of solid modeling, which is pretty universal across most of the major packages.  The individual commands might be slightly different but an extrude or sweep is still the same in most 3D packages.  Once you learn how to model then you can get good at using a specific package such as Solidworks.  Most of us are still learning new things the software can do even though we have been users for years.

At Chaffey College in Rancho Cucamonga we offer several SolidWorks courses as a part of our Drafting and Engineering Technology programs. In one of our courses, DRAFT 43, we prepare and get students through the CSWA exam. In our more advanced course DRAFT 78 we prepare students for the CSWP and they are expected to pass it before the end of the semester.