- Building Industry Association of Southern California - A trade association that lobbies for the contractors and land developers of the area. Has information on housing and labor relations between developers and their contractors.
- Plastering Contractors Association of Southern California - A non-profit trade association.
- Printing Industries Association of Southern California - Trade association for the graphic arts community. Membership information, services, and resources.
- Professional Communications Exchange - Network of independent public relations, web and graphics designers, and marketing communications freelancers in Southern California.
- Solid Waste Association of North America: Southern California Chapter - Board members, conference and event schedule, newsletter, and job listings.
- Southern California Council of Quilt Guilds - Promotes knowledge and participation in the craft/art form of quilting, patchwork, appliqué, and all other aspects of quilt making. Membership information, newsletter, and schedule of shows and meetings.
- Southern California Industrial Safety Society (SCISS) - Established in 1920, the oldest non-profit organization for environmental, health and safety professionals.
- Southern California Surveyors Joint Apprenticeship Committee - An organization for land surveying education sometimes known as Southern California JAC or SCSJAC. Includes qualifications, wages and work and course summary.
- TechBiz Connection - A professional trade association supporting technology executives. Includes events, audio downloads, forums and resources.
- The Japanese Chamber of Commerce of Southern California - Provides opportunities and services for business development, promote the welfare of the local Japanese American community. Member directory, event calendar, and history.
