Southern California Ghost Hunters
- Attempts to combine theories of metaphysics and parapsychology in order to explain haunts. Offers member bios, images, upcoming events, and details about the group.
- http://www.southerncaliforniaghosthunters.com

PhenomQuest Paranormal Investigators
- Based in the Los Angeles area. Focuses on spirit photography. Provides galleries, audio/video recordings, forums, and a directory.
- http://www.phenomquest.net/

Southern California Ghost Hunters Society
- Based in San Gabriel Valley. Provides recordings, image galleries, investigative articles, and a directory.
- http://www.scghs.com

The Southern California Society For Paranormal Research
- Provides a library of resource articles, forums, case write-ups, and relevant book titles.
- http://www.scspr.org

Ghost Trackers
- Dedicated to the research, investigation, and documentation of hauntings in Northern California. Includes calendar of events, articles, photographs, and audio/video recordings.
- http://www.ghost-trackers.org/

Orange County Paranormal Researchers
- Investigates all forms of supernatural activity. Includes member bios, links, EVPs, and images.
- http://www.ocprgroup.com

Bay Area Paranormal Investigations
- Located in the San Francisco Bay Area. Lists provided services and related resources.
- http://www.bayareaparanormal.com