- Quick Signs
 - Tustin - Offers banners, decals, posters, lettering, and more. - Gold Graphics
- Pacoima - Provides commercial screen printing, production, installation, and fulfillment services.
- Stanco Signage Systems Inc.
- Santa Ana - Designers and builders of signage, including wayfinding, promotion, banners, and vehicle graphics.
- AAA Flag & Banner
- Los Angeles - Manufacturer of large and small format digital and screen printed banners, flags, and signs.
- Neon Design A-Sign Mfg.
- Laguna Niguel - Offering neon signs, clocks, and light ropes as well as fibre optics signs, LED moving messages, POP displays, and more.
- Classic Letters, Inc.
- Torrance - Custom manufacturer of architectural 3D fabrication, and cut outs.
- Southern Californa Bronze Company
- Los Angeles - Distributors of architectural signage including bronze, brass, aluminium, and stainless steel. Products include cast plaques, letters, etched metal, time capsule markers, and more.
- Banner4Sale.com
- Riverside - Offers banner printing services including vinyl, silk screen, outdoor banners, large scale banners, as well as school and tradeshow banners.
- Olympus Enterprises
- Pacoima - Providing banners, mobile billboards and kiosks, inflatables, boat and airship displays, and other advertising.
- Sign Express
- Orange - Signs, banners, graphics, vehicle lettering, and digital displays.
- Calsign
- Costa Mesa - Offers vinyl signs and graphics.
- Accurate Dial & Nameplate, Inc.
- Glendale - Makers of custom nameplates, plaques, asset tags, and more.
- Karman Ltd Architectural Signs
- Canoga Park - Manufactures and installs custom and standard architectural signs.
- JRS Company Inc.
- Covina - Manufacturer of sign frames and holders.
- Design and Documentation
- Mission Viejo - Planning and designing commercial signage.
- Moon International
- Chino - Manufacturer of directional signage, dimensional lettering, aisle markers, checkstand lights, and pricing boards. Also offers store interior design services.
- Sign Methods
- Signal Hill - Producing custom-designed outdoor signage for businesses.
- Signs By Beach
- Newport Beach - Interior and exterior signage, illuminated signs, vehicle graphics, banners, trade shows, logos/decals, and large digital printing.
- Davidson & Chung Sign Company
- Santa Ana - Signs, banners, vinyl lettering, and more.
- H. Toji Companies, The
- Gardena - Manufacturer of signs complying with the Americans with Disabilities Act. Offering wayfinding consulting, graphic design, and installation.
- Sign Shop, The
- Rancho Cucamonga - Makers of vinyl banners, window and vehicle lettering, magnetic, sandblasted, wood, and acrylic metal signs.
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